feat: 实现注册优惠码功能

- 支持创建/编辑/删除优惠码，设置赠送金额和使用限制 - 注册页面实时验证优惠码并显示赠送金额 - 支持 URL 参数自动填充 (?promo=CODE) - 添加优惠码验证接口速率限制 - 使用数据库行锁防止并发超限 - 新增后台优惠码管理页面，支持复制注册链接
2026-01-10 13:14:35 +08:00
parent 7d1fe818be
commit d2fc14fb97
79 changed files with 17045 additions and 54 deletions
--- a/backend/internal/handler/admin/promo_handler.go
+++ b/backend/internal/handler/admin/promo_handler.go
@@ -0,0 +1,209 @@
+package admin
+
+import (
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/Wei-Shaw/sub2api/internal/handler/dto"
+	"github.com/Wei-Shaw/sub2api/internal/pkg/pagination"
+	"github.com/Wei-Shaw/sub2api/internal/pkg/response"
+	"github.com/Wei-Shaw/sub2api/internal/service"
+
+	"github.com/gin-gonic/gin"
+)
+
+// PromoHandler handles admin promo code management
+type PromoHandler struct {
+	promoService *service.PromoService
+}
+
+// NewPromoHandler creates a new admin promo handler
+func NewPromoHandler(promoService *service.PromoService) *PromoHandler {
+	return &PromoHandler{
+		promoService: promoService,
+	}
+}
+
+// CreatePromoCodeRequest represents create promo code request
+type CreatePromoCodeRequest struct {
+	Code        string  `json:"code"`                                    // 可选，为空则自动生成
+	BonusAmount float64 `json:"bonus_amount" binding:"required,min=0"`   // 赠送余额
+	MaxUses     int     `json:"max_uses" binding:"min=0"`                // 最大使用次数，0=无限
+	ExpiresAt   *int64  `json:"expires_at"`                              // 过期时间戳（秒）
+	Notes       string  `json:"notes"`                                   // 备注
+}
+
+// UpdatePromoCodeRequest represents update promo code request
+type UpdatePromoCodeRequest struct {
+	Code        *string  `json:"code"`
+	BonusAmount *float64 `json:"bonus_amount" binding:"omitempty,min=0"`
+	MaxUses     *int     `json:"max_uses" binding:"omitempty,min=0"`
+	Status      *string  `json:"status" binding:"omitempty,oneof=active disabled"`
+	ExpiresAt   *int64   `json:"expires_at"`
+	Notes       *string  `json:"notes"`
+}
+
+// List handles listing all promo codes with pagination
+// GET /api/v1/admin/promo-codes
+func (h *PromoHandler) List(c *gin.Context) {
+	page, pageSize := response.ParsePagination(c)
+	status := c.Query("status")
+	search := strings.TrimSpace(c.Query("search"))
+	if len(search) > 100 {
+		search = search[:100]
+	}
+
+	params := pagination.PaginationParams{
+		Page:     page,
+		PageSize: pageSize,
+	}
+
+	codes, paginationResult, err := h.promoService.List(c.Request.Context(), params, status, search)
+	if err != nil {
+		response.ErrorFrom(c, err)
+		return
+	}
+
+	out := make([]dto.PromoCode, 0, len(codes))
+	for i := range codes {
+		out = append(out, *dto.PromoCodeFromService(&codes[i]))
+	}
+	response.Paginated(c, out, paginationResult.Total, page, pageSize)
+}
+
+// GetByID handles getting a promo code by ID
+// GET /api/v1/admin/promo-codes/:id
+func (h *PromoHandler) GetByID(c *gin.Context) {
+	codeID, err := strconv.ParseInt(c.Param("id"), 10, 64)
+	if err != nil {
+		response.BadRequest(c, "Invalid promo code ID")
+		return
+	}
+
+	code, err := h.promoService.GetByID(c.Request.Context(), codeID)
+	if err != nil {
+		response.ErrorFrom(c, err)
+		return
+	}
+
+	response.Success(c, dto.PromoCodeFromService(code))
+}
+
+// Create handles creating a new promo code
+// POST /api/v1/admin/promo-codes
+func (h *PromoHandler) Create(c *gin.Context) {
+	var req CreatePromoCodeRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		response.BadRequest(c, "Invalid request: "+err.Error())
+		return
+	}
+
+	input := &service.CreatePromoCodeInput{
+		Code:        req.Code,
+		BonusAmount: req.BonusAmount,
+		MaxUses:     req.MaxUses,
+		Notes:       req.Notes,
+	}
+
+	if req.ExpiresAt != nil {
+		t := time.Unix(*req.ExpiresAt, 0)
+		input.ExpiresAt = &t
+	}
+
+	code, err := h.promoService.Create(c.Request.Context(), input)
+	if err != nil {
+		response.ErrorFrom(c, err)
+		return
+	}
+
+	response.Success(c, dto.PromoCodeFromService(code))
+}
+
+// Update handles updating a promo code
+// PUT /api/v1/admin/promo-codes/:id
+func (h *PromoHandler) Update(c *gin.Context) {
+	codeID, err := strconv.ParseInt(c.Param("id"), 10, 64)
+	if err != nil {
+		response.BadRequest(c, "Invalid promo code ID")
+		return
+	}
+
+	var req UpdatePromoCodeRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		response.BadRequest(c, "Invalid request: "+err.Error())
+		return
+	}
+
+	input := &service.UpdatePromoCodeInput{
+		Code:        req.Code,
+		BonusAmount: req.BonusAmount,
+		MaxUses:     req.MaxUses,
+		Status:      req.Status,
+		Notes:       req.Notes,
+	}
+
+	if req.ExpiresAt != nil {
+		if *req.ExpiresAt == 0 {
+			// 0 表示清除过期时间
+			input.ExpiresAt = nil
+		} else {
+			t := time.Unix(*req.ExpiresAt, 0)
+			input.ExpiresAt = &t
+		}
+	}
+
+	code, err := h.promoService.Update(c.Request.Context(), codeID, input)
+	if err != nil {
+		response.ErrorFrom(c, err)
+		return
+	}
+
+	response.Success(c, dto.PromoCodeFromService(code))
+}
+
+// Delete handles deleting a promo code
+// DELETE /api/v1/admin/promo-codes/:id
+func (h *PromoHandler) Delete(c *gin.Context) {
+	codeID, err := strconv.ParseInt(c.Param("id"), 10, 64)
+	if err != nil {
+		response.BadRequest(c, "Invalid promo code ID")
+		return
+	}
+
+	err = h.promoService.Delete(c.Request.Context(), codeID)
+	if err != nil {
+		response.ErrorFrom(c, err)
+		return
+	}
+
+	response.Success(c, gin.H{"message": "Promo code deleted successfully"})
+}
+
+// GetUsages handles getting usage records for a promo code
+// GET /api/v1/admin/promo-codes/:id/usages
+func (h *PromoHandler) GetUsages(c *gin.Context) {
+	codeID, err := strconv.ParseInt(c.Param("id"), 10, 64)
+	if err != nil {
+		response.BadRequest(c, "Invalid promo code ID")
+		return
+	}
+
+	page, pageSize := response.ParsePagination(c)
+	params := pagination.PaginationParams{
+		Page:     page,
+		PageSize: pageSize,
+	}
+
+	usages, paginationResult, err := h.promoService.ListUsages(c.Request.Context(), codeID, params)
+	if err != nil {
+		response.ErrorFrom(c, err)
+		return
+	}
+
+	out := make([]dto.PromoCodeUsage, 0, len(usages))
+	for i := range usages {
+		out = append(out, *dto.PromoCodeUsageFromService(&usages[i]))
+	}
+	response.Paginated(c, out, paginationResult.Total, page, pageSize)
+}
--- a/backend/internal/handler/auth_handler.go
+++ b/backend/internal/handler/auth_handler.go
@@ -12,19 +12,21 @@ import (

 // AuthHandler handles authentication-related requests
 type AuthHandler struct {
-	cfg         *config.Config
-	authService *service.AuthService
-	userService *service.UserService
-	settingSvc  *service.SettingService
+	cfg          *config.Config
+	authService  *service.AuthService
+	userService  *service.UserService
+	settingSvc   *service.SettingService
+	promoService *service.PromoService
 }

 // NewAuthHandler creates a new AuthHandler
-func NewAuthHandler(cfg *config.Config, authService *service.AuthService, userService *service.UserService, settingService *service.SettingService) *AuthHandler {
+func NewAuthHandler(cfg *config.Config, authService *service.AuthService, userService *service.UserService, settingService *service.SettingService, promoService *service.PromoService) *AuthHandler {
 	return &AuthHandler{
-		cfg:         cfg,
-		authService: authService,
-		userService: userService,
-		settingSvc:  settingService,
+		cfg:          cfg,
+		authService:  authService,
+		userService:  userService,
+		settingSvc:   settingService,
+		promoService: promoService,
 	}
 }

@@ -34,6 +36,7 @@ type RegisterRequest struct {
 	Password       string `json:"password" binding:"required,min=6"`
 	VerifyCode     string `json:"verify_code"`
 	TurnstileToken string `json:"turnstile_token"`
+	PromoCode      string `json:"promo_code"` // 注册优惠码
 }

 // SendVerifyCodeRequest 发送验证码请求
@@ -79,7 +82,7 @@ func (h *AuthHandler) Register(c *gin.Context) {
 		}
 	}

-	token, user, err := h.authService.RegisterWithVerification(c.Request.Context(), req.Email, req.Password, req.VerifyCode)
+	token, user, err := h.authService.RegisterWithVerification(c.Request.Context(), req.Email, req.Password, req.VerifyCode, req.PromoCode)
 	if err != nil {
 		response.ErrorFrom(c, err)
 		return
@@ -174,3 +177,63 @@ func (h *AuthHandler) GetCurrentUser(c *gin.Context) {

 	response.Success(c, UserResponse{User: dto.UserFromService(user), RunMode: runMode})
 }
+
+// ValidatePromoCodeRequest 验证优惠码请求
+type ValidatePromoCodeRequest struct {
+	Code string `json:"code" binding:"required"`
+}
+
+// ValidatePromoCodeResponse 验证优惠码响应
+type ValidatePromoCodeResponse struct {
+	Valid       bool    `json:"valid"`
+	BonusAmount float64 `json:"bonus_amount,omitempty"`
+	ErrorCode   string  `json:"error_code,omitempty"`
+	Message     string  `json:"message,omitempty"`
+}
+
+// ValidatePromoCode 验证优惠码（公开接口，注册前调用）
+// POST /api/v1/auth/validate-promo-code
+func (h *AuthHandler) ValidatePromoCode(c *gin.Context) {
+	var req ValidatePromoCodeRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		response.BadRequest(c, "Invalid request: "+err.Error())
+		return
+	}
+
+	promoCode, err := h.promoService.ValidatePromoCode(c.Request.Context(), req.Code)
+	if err != nil {
+		// 根据错误类型返回对应的错误码
+		errorCode := "PROMO_CODE_INVALID"
+		switch err {
+		case service.ErrPromoCodeNotFound:
+			errorCode = "PROMO_CODE_NOT_FOUND"
+		case service.ErrPromoCodeExpired:
+			errorCode = "PROMO_CODE_EXPIRED"
+		case service.ErrPromoCodeDisabled:
+			errorCode = "PROMO_CODE_DISABLED"
+		case service.ErrPromoCodeMaxUsed:
+			errorCode = "PROMO_CODE_MAX_USED"
+		case service.ErrPromoCodeAlreadyUsed:
+			errorCode = "PROMO_CODE_ALREADY_USED"
+		}
+
+		response.Success(c, ValidatePromoCodeResponse{
+			Valid:     false,
+			ErrorCode: errorCode,
+		})
+		return
+	}
+
+	if promoCode == nil {
+		response.Success(c, ValidatePromoCodeResponse{
+			Valid:     false,
+			ErrorCode: "PROMO_CODE_INVALID",
+		})
+		return
+	}
+
+	response.Success(c, ValidatePromoCodeResponse{
+		Valid:       true,
+		BonusAmount: promoCode.BonusAmount,
+	})
+}
--- a/backend/internal/handler/dto/mappers.go
+++ b/backend/internal/handler/dto/mappers.go
@@ -370,3 +370,35 @@ func BulkAssignResultFromService(r *service.BulkAssignResult) *BulkAssignResult
 		Errors:        r.Errors,
 	}
 }
+
+func PromoCodeFromService(pc *service.PromoCode) *PromoCode {
+	if pc == nil {
+		return nil
+	}
+	return &PromoCode{
+		ID:          pc.ID,
+		Code:        pc.Code,
+		BonusAmount: pc.BonusAmount,
+		MaxUses:     pc.MaxUses,
+		UsedCount:   pc.UsedCount,
+		Status:      pc.Status,
+		ExpiresAt:   pc.ExpiresAt,
+		Notes:       pc.Notes,
+		CreatedAt:   pc.CreatedAt,
+		UpdatedAt:   pc.UpdatedAt,
+	}
+}
+
+func PromoCodeUsageFromService(u *service.PromoCodeUsage) *PromoCodeUsage {
+	if u == nil {
+		return nil
+	}
+	return &PromoCodeUsage{
+		ID:          u.ID,
+		PromoCodeID: u.PromoCodeID,
+		UserID:      u.UserID,
+		BonusAmount: u.BonusAmount,
+		UsedAt:      u.UsedAt,
+		User:        UserFromServiceShallow(u.User),
+	}
+}
--- a/backend/internal/handler/dto/types.go
+++ b/backend/internal/handler/dto/types.go
@@ -250,3 +250,28 @@ type BulkAssignResult struct {
 	Subscriptions []UserSubscription `json:"subscriptions"`
 	Errors        []string           `json:"errors"`
 }
+
+// PromoCode 注册优惠码
+type PromoCode struct {
+	ID          int64      `json:"id"`
+	Code        string     `json:"code"`
+	BonusAmount float64    `json:"bonus_amount"`
+	MaxUses     int        `json:"max_uses"`
+	UsedCount   int        `json:"used_count"`
+	Status      string     `json:"status"`
+	ExpiresAt   *time.Time `json:"expires_at"`
+	Notes       string     `json:"notes"`
+	CreatedAt   time.Time  `json:"created_at"`
+	UpdatedAt   time.Time  `json:"updated_at"`
+}
+
+// PromoCodeUsage 优惠码使用记录
+type PromoCodeUsage struct {
+	ID          int64     `json:"id"`
+	PromoCodeID int64     `json:"promo_code_id"`
+	UserID      int64     `json:"user_id"`
+	BonusAmount float64   `json:"bonus_amount"`
+	UsedAt      time.Time `json:"used_at"`
+
+	User *User `json:"user,omitempty"`
+}
--- a/backend/internal/handler/handler.go
+++ b/backend/internal/handler/handler.go
@@ -16,6 +16,7 @@ type AdminHandlers struct {
 	AntigravityOAuth *admin.AntigravityOAuthHandler
 	Proxy            *admin.ProxyHandler
 	Redeem           *admin.RedeemHandler
+	Promo            *admin.PromoHandler
 	Setting          *admin.SettingHandler
 	System           *admin.SystemHandler
 	Subscription     *admin.SubscriptionHandler
--- a/backend/internal/handler/wire.go
+++ b/backend/internal/handler/wire.go
@@ -19,6 +19,7 @@ func ProvideAdminHandlers(
 	antigravityOAuthHandler *admin.AntigravityOAuthHandler,
 	proxyHandler *admin.ProxyHandler,
 	redeemHandler *admin.RedeemHandler,
+	promoHandler *admin.PromoHandler,
 	settingHandler *admin.SettingHandler,
 	systemHandler *admin.SystemHandler,
 	subscriptionHandler *admin.SubscriptionHandler,
@@ -36,6 +37,7 @@ func ProvideAdminHandlers(
 		AntigravityOAuth: antigravityOAuthHandler,
 		Proxy:            proxyHandler,
 		Redeem:           redeemHandler,
+		Promo:            promoHandler,
 		Setting:          settingHandler,
 		System:           systemHandler,
 		Subscription:     subscriptionHandler,
@@ -105,6 +107,7 @@ var ProviderSet = wire.NewSet(
 	admin.NewAntigravityOAuthHandler,
 	admin.NewProxyHandler,
 	admin.NewRedeemHandler,
+	admin.NewPromoHandler,
 	admin.NewSettingHandler,
 	ProvideSystemHandler,
 	admin.NewSubscriptionHandler,
--- a/backend/internal/middleware/rate_limiter.go
+++ b/backend/internal/middleware/rate_limiter.go
@@ -0,0 +1,60 @@
+package middleware
+
+import (
+	"net/http"
+	"time"
+
+	"github.com/gin-gonic/gin"
+	"github.com/redis/go-redis/v9"
+)
+
+// RateLimiter Redis 速率限制器
+type RateLimiter struct {
+	redis  *redis.Client
+	prefix string
+}
+
+// NewRateLimiter 创建速率限制器实例
+func NewRateLimiter(redisClient *redis.Client) *RateLimiter {
+	return &RateLimiter{
+		redis:  redisClient,
+		prefix: "rate_limit:",
+	}
+}
+
+// Limit 返回速率限制中间件
+// key: 限制类型标识
+// limit: 时间窗口内最大请求数
+// window: 时间窗口
+func (r *RateLimiter) Limit(key string, limit int, window time.Duration) gin.HandlerFunc {
+	return func(c *gin.Context) {
+		ip := c.ClientIP()
+		redisKey := r.prefix + key + ":" + ip
+
+		ctx := c.Request.Context()
+
+		// 使用 INCR 原子操作增加计数
+		count, err := r.redis.Incr(ctx, redisKey).Result()
+		if err != nil {
+			// Redis 错误时放行，避免影响正常服务
+			c.Next()
+			return
+		}
+
+		// 首次访问时设置过期时间
+		if count == 1 {
+			r.redis.Expire(ctx, redisKey, window)
+		}
+
+		// 超过限制
+		if count > int64(limit) {
+			c.AbortWithStatusJSON(http.StatusTooManyRequests, gin.H{
+				"error":   "rate limit exceeded",
+				"message": "Too many requests, please try again later",
+			})
+			return
+		}
+
+		c.Next()
+	}
+}
--- a/backend/internal/repository/promo_code_repo.go
+++ b/backend/internal/repository/promo_code_repo.go
@@ -0,0 +1,273 @@
+package repository
+
+import (
+	"context"
+
+	dbent "github.com/Wei-Shaw/sub2api/ent"
+	"github.com/Wei-Shaw/sub2api/ent/promocode"
+	"github.com/Wei-Shaw/sub2api/ent/promocodeusage"
+	"github.com/Wei-Shaw/sub2api/internal/pkg/pagination"
+	"github.com/Wei-Shaw/sub2api/internal/service"
+)
+
+type promoCodeRepository struct {
+	client *dbent.Client
+}
+
+func NewPromoCodeRepository(client *dbent.Client) service.PromoCodeRepository {
+	return &promoCodeRepository{client: client}
+}
+
+func (r *promoCodeRepository) Create(ctx context.Context, code *service.PromoCode) error {
+	client := clientFromContext(ctx, r.client)
+	builder := client.PromoCode.Create().
+		SetCode(code.Code).
+		SetBonusAmount(code.BonusAmount).
+		SetMaxUses(code.MaxUses).
+		SetUsedCount(code.UsedCount).
+		SetStatus(code.Status).
+		SetNotes(code.Notes)
+
+	if code.ExpiresAt != nil {
+		builder.SetExpiresAt(*code.ExpiresAt)
+	}
+
+	created, err := builder.Save(ctx)
+	if err != nil {
+		return err
+	}
+
+	code.ID = created.ID
+	code.CreatedAt = created.CreatedAt
+	code.UpdatedAt = created.UpdatedAt
+	return nil
+}
+
+func (r *promoCodeRepository) GetByID(ctx context.Context, id int64) (*service.PromoCode, error) {
+	m, err := r.client.PromoCode.Query().
+		Where(promocode.IDEQ(id)).
+		Only(ctx)
+	if err != nil {
+		if dbent.IsNotFound(err) {
+			return nil, service.ErrPromoCodeNotFound
+		}
+		return nil, err
+	}
+	return promoCodeEntityToService(m), nil
+}
+
+func (r *promoCodeRepository) GetByCode(ctx context.Context, code string) (*service.PromoCode, error) {
+	m, err := r.client.PromoCode.Query().
+		Where(promocode.CodeEqualFold(code)).
+		Only(ctx)
+	if err != nil {
+		if dbent.IsNotFound(err) {
+			return nil, service.ErrPromoCodeNotFound
+		}
+		return nil, err
+	}
+	return promoCodeEntityToService(m), nil
+}
+
+func (r *promoCodeRepository) GetByCodeForUpdate(ctx context.Context, code string) (*service.PromoCode, error) {
+	client := clientFromContext(ctx, r.client)
+	m, err := client.PromoCode.Query().
+		Where(promocode.CodeEqualFold(code)).
+		ForUpdate().
+		Only(ctx)
+	if err != nil {
+		if dbent.IsNotFound(err) {
+			return nil, service.ErrPromoCodeNotFound
+		}
+		return nil, err
+	}
+	return promoCodeEntityToService(m), nil
+}
+
+func (r *promoCodeRepository) Update(ctx context.Context, code *service.PromoCode) error {
+	client := clientFromContext(ctx, r.client)
+	builder := client.PromoCode.UpdateOneID(code.ID).
+		SetCode(code.Code).
+		SetBonusAmount(code.BonusAmount).
+		SetMaxUses(code.MaxUses).
+		SetUsedCount(code.UsedCount).
+		SetStatus(code.Status).
+		SetNotes(code.Notes)
+
+	if code.ExpiresAt != nil {
+		builder.SetExpiresAt(*code.ExpiresAt)
+	} else {
+		builder.ClearExpiresAt()
+	}
+
+	updated, err := builder.Save(ctx)
+	if err != nil {
+		if dbent.IsNotFound(err) {
+			return service.ErrPromoCodeNotFound
+		}
+		return err
+	}
+
+	code.UpdatedAt = updated.UpdatedAt
+	return nil
+}
+
+func (r *promoCodeRepository) Delete(ctx context.Context, id int64) error {
+	client := clientFromContext(ctx, r.client)
+	_, err := client.PromoCode.Delete().Where(promocode.IDEQ(id)).Exec(ctx)
+	return err
+}
+
+func (r *promoCodeRepository) List(ctx context.Context, params pagination.PaginationParams) ([]service.PromoCode, *pagination.PaginationResult, error) {
+	return r.ListWithFilters(ctx, params, "", "")
+}
+
+func (r *promoCodeRepository) ListWithFilters(ctx context.Context, params pagination.PaginationParams, status, search string) ([]service.PromoCode, *pagination.PaginationResult, error) {
+	q := r.client.PromoCode.Query()
+
+	if status != "" {
+		q = q.Where(promocode.StatusEQ(status))
+	}
+	if search != "" {
+		q = q.Where(promocode.CodeContainsFold(search))
+	}
+
+	total, err := q.Count(ctx)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	codes, err := q.
+		Offset(params.Offset()).
+		Limit(params.Limit()).
+		Order(dbent.Desc(promocode.FieldID)).
+		All(ctx)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	outCodes := promoCodeEntitiesToService(codes)
+
+	return outCodes, paginationResultFromTotal(int64(total), params), nil
+}
+
+func (r *promoCodeRepository) CreateUsage(ctx context.Context, usage *service.PromoCodeUsage) error {
+	client := clientFromContext(ctx, r.client)
+	created, err := client.PromoCodeUsage.Create().
+		SetPromoCodeID(usage.PromoCodeID).
+		SetUserID(usage.UserID).
+		SetBonusAmount(usage.BonusAmount).
+		SetUsedAt(usage.UsedAt).
+		Save(ctx)
+	if err != nil {
+		return err
+	}
+
+	usage.ID = created.ID
+	return nil
+}
+
+func (r *promoCodeRepository) GetUsageByPromoCodeAndUser(ctx context.Context, promoCodeID, userID int64) (*service.PromoCodeUsage, error) {
+	m, err := r.client.PromoCodeUsage.Query().
+		Where(
+			promocodeusage.PromoCodeIDEQ(promoCodeID),
+			promocodeusage.UserIDEQ(userID),
+		).
+		Only(ctx)
+	if err != nil {
+		if dbent.IsNotFound(err) {
+			return nil, nil
+		}
+		return nil, err
+	}
+	return promoCodeUsageEntityToService(m), nil
+}
+
+func (r *promoCodeRepository) ListUsagesByPromoCode(ctx context.Context, promoCodeID int64, params pagination.PaginationParams) ([]service.PromoCodeUsage, *pagination.PaginationResult, error) {
+	q := r.client.PromoCodeUsage.Query().
+		Where(promocodeusage.PromoCodeIDEQ(promoCodeID))
+
+	total, err := q.Count(ctx)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	usages, err := q.
+		WithUser().
+		Offset(params.Offset()).
+		Limit(params.Limit()).
+		Order(dbent.Desc(promocodeusage.FieldID)).
+		All(ctx)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	outUsages := promoCodeUsageEntitiesToService(usages)
+
+	return outUsages, paginationResultFromTotal(int64(total), params), nil
+}
+
+func (r *promoCodeRepository) IncrementUsedCount(ctx context.Context, id int64) error {
+	client := clientFromContext(ctx, r.client)
+	_, err := client.PromoCode.UpdateOneID(id).
+		AddUsedCount(1).
+		Save(ctx)
+	return err
+}
+
+// Entity to Service conversions
+
+func promoCodeEntityToService(m *dbent.PromoCode) *service.PromoCode {
+	if m == nil {
+		return nil
+	}
+	return &service.PromoCode{
+		ID:          m.ID,
+		Code:        m.Code,
+		BonusAmount: m.BonusAmount,
+		MaxUses:     m.MaxUses,
+		UsedCount:   m.UsedCount,
+		Status:      m.Status,
+		ExpiresAt:   m.ExpiresAt,
+		Notes:       derefString(m.Notes),
+		CreatedAt:   m.CreatedAt,
+		UpdatedAt:   m.UpdatedAt,
+	}
+}
+
+func promoCodeEntitiesToService(models []*dbent.PromoCode) []service.PromoCode {
+	out := make([]service.PromoCode, 0, len(models))
+	for i := range models {
+		if s := promoCodeEntityToService(models[i]); s != nil {
+			out = append(out, *s)
+		}
+	}
+	return out
+}
+
+func promoCodeUsageEntityToService(m *dbent.PromoCodeUsage) *service.PromoCodeUsage {
+	if m == nil {
+		return nil
+	}
+	out := &service.PromoCodeUsage{
+		ID:          m.ID,
+		PromoCodeID: m.PromoCodeID,
+		UserID:      m.UserID,
+		BonusAmount: m.BonusAmount,
+		UsedAt:      m.UsedAt,
+	}
+	if m.Edges.User != nil {
+		out.User = userEntityToService(m.Edges.User)
+	}
+	return out
+}
+
+func promoCodeUsageEntitiesToService(models []*dbent.PromoCodeUsage) []service.PromoCodeUsage {
+	out := make([]service.PromoCodeUsage, 0, len(models))
+	for i := range models {
+		if s := promoCodeUsageEntityToService(models[i]); s != nil {
+			out = append(out, *s)
+		}
+	}
+	return out
+}
--- a/backend/internal/repository/wire.go
+++ b/backend/internal/repository/wire.go
@@ -45,6 +45,7 @@ var ProviderSet = wire.NewSet(
 	NewAccountRepository,
 	NewProxyRepository,
 	NewRedeemCodeRepository,
+	NewPromoCodeRepository,
 	NewUsageLogRepository,
 	NewSettingRepository,
 	NewUserSubscriptionRepository,
--- a/backend/internal/server/http.go
+++ b/backend/internal/server/http.go
@@ -13,6 +13,7 @@ import (

 	"github.com/gin-gonic/gin"
 	"github.com/google/wire"
+	"github.com/redis/go-redis/v9"
 )

 // ProviderSet 提供服务器层的依赖
@@ -30,6 +31,7 @@ func ProvideRouter(
 	apiKeyAuth middleware2.APIKeyAuthMiddleware,
 	apiKeyService *service.APIKeyService,
 	subscriptionService *service.SubscriptionService,
+	redisClient *redis.Client,
 ) *gin.Engine {
 	if cfg.Server.Mode == "release" {
 		gin.SetMode(gin.ReleaseMode)
@@ -47,7 +49,7 @@ func ProvideRouter(
 		}
 	}

-	return SetupRouter(r, handlers, jwtAuth, adminAuth, apiKeyAuth, apiKeyService, subscriptionService, cfg)
+	return SetupRouter(r, handlers, jwtAuth, adminAuth, apiKeyAuth, apiKeyService, subscriptionService, cfg, redisClient)
 }

 // ProvideHTTPServer 提供 HTTP 服务器
--- a/backend/internal/server/router.go
+++ b/backend/internal/server/router.go
@@ -9,6 +9,7 @@ import (
 	"github.com/Wei-Shaw/sub2api/internal/web"

 	"github.com/gin-gonic/gin"
+	"github.com/redis/go-redis/v9"
 )

 // SetupRouter 配置路由器中间件和路由
@@ -21,6 +22,7 @@ func SetupRouter(
 	apiKeyService *service.APIKeyService,
 	subscriptionService *service.SubscriptionService,
 	cfg *config.Config,
+	redisClient *redis.Client,
 ) *gin.Engine {
 	// 应用中间件
 	r.Use(middleware2.Logger())
@@ -33,7 +35,7 @@ func SetupRouter(
 	}

 	// 注册路由
-	registerRoutes(r, handlers, jwtAuth, adminAuth, apiKeyAuth, apiKeyService, subscriptionService, cfg)
+	registerRoutes(r, handlers, jwtAuth, adminAuth, apiKeyAuth, apiKeyService, subscriptionService, cfg, redisClient)

 	return r
 }
@@ -48,6 +50,7 @@ func registerRoutes(
 	apiKeyService *service.APIKeyService,
 	subscriptionService *service.SubscriptionService,
 	cfg *config.Config,
+	redisClient *redis.Client,
 ) {
 	// 通用路由（健康检查、状态等）
 	routes.RegisterCommonRoutes(r)
@@ -56,7 +59,7 @@ func registerRoutes(
 	v1 := r.Group("/api/v1")

 	// 注册各模块路由
-	routes.RegisterAuthRoutes(v1, h, jwtAuth)
+	routes.RegisterAuthRoutes(v1, h, jwtAuth, redisClient)
 	routes.RegisterUserRoutes(v1, h, jwtAuth)
 	routes.RegisterAdminRoutes(v1, h, adminAuth)
 	routes.RegisterGatewayRoutes(r, h, apiKeyAuth, apiKeyService, subscriptionService, cfg)
--- a/backend/internal/server/routes/admin.go
+++ b/backend/internal/server/routes/admin.go
@@ -44,6 +44,9 @@ func RegisterAdminRoutes(
 		// 卡密管理
 		registerRedeemCodeRoutes(admin, h)

+		// 优惠码管理
+		registerPromoCodeRoutes(admin, h)
+
 		// 系统设置
 		registerSettingsRoutes(admin, h)

@@ -201,6 +204,18 @@ func registerRedeemCodeRoutes(admin *gin.RouterGroup, h *handler.Handlers) {
 	}
 }

+func registerPromoCodeRoutes(admin *gin.RouterGroup, h *handler.Handlers) {
+	promoCodes := admin.Group("/promo-codes")
+	{
+		promoCodes.GET("", h.Admin.Promo.List)
+		promoCodes.GET("/:id", h.Admin.Promo.GetByID)
+		promoCodes.POST("", h.Admin.Promo.Create)
+		promoCodes.PUT("/:id", h.Admin.Promo.Update)
+		promoCodes.DELETE("/:id", h.Admin.Promo.Delete)
+		promoCodes.GET("/:id/usages", h.Admin.Promo.GetUsages)
+	}
+}
+
 func registerSettingsRoutes(admin *gin.RouterGroup, h *handler.Handlers) {
 	adminSettings := admin.Group("/settings")
 	{
--- a/backend/internal/server/routes/auth.go
+++ b/backend/internal/server/routes/auth.go
@@ -1,24 +1,34 @@
 package routes

 import (
+	"time"
+
 	"github.com/Wei-Shaw/sub2api/internal/handler"
-	"github.com/Wei-Shaw/sub2api/internal/server/middleware"
+	"github.com/Wei-Shaw/sub2api/internal/middleware"
+	servermiddleware "github.com/Wei-Shaw/sub2api/internal/server/middleware"

 	"github.com/gin-gonic/gin"
+	"github.com/redis/go-redis/v9"
 )

 // RegisterAuthRoutes 注册认证相关路由
 func RegisterAuthRoutes(
 	v1 *gin.RouterGroup,
 	h *handler.Handlers,
-	jwtAuth middleware.JWTAuthMiddleware,
+	jwtAuth servermiddleware.JWTAuthMiddleware,
+	redisClient *redis.Client,
 ) {
+	// 创建速率限制器
+	rateLimiter := middleware.NewRateLimiter(redisClient)
+
 	// 公开接口
 	auth := v1.Group("/auth")
 	{
 		auth.POST("/register", h.Auth.Register)
 		auth.POST("/login", h.Auth.Login)
 		auth.POST("/send-verify-code", h.Auth.SendVerifyCode)
+		// 优惠码验证接口添加速率限制：每分钟最多 10 次
+		auth.POST("/validate-promo-code", rateLimiter.Limit("validate-promo", 10, time.Minute), h.Auth.ValidatePromoCode)
 		auth.GET("/oauth/linuxdo/start", h.Auth.LinuxDoOAuthStart)
 		auth.GET("/oauth/linuxdo/callback", h.Auth.LinuxDoOAuthCallback)
 	}
--- a/backend/internal/service/auth_service.go
+++ b/backend/internal/service/auth_service.go
@@ -52,6 +52,7 @@ type AuthService struct {
 	emailService      *EmailService
 	turnstileService  *TurnstileService
 	emailQueueService *EmailQueueService
+	promoService      *PromoService
 }

 // NewAuthService 创建认证服务实例
@@ -62,6 +63,7 @@ func NewAuthService(
 	emailService *EmailService,
 	turnstileService *TurnstileService,
 	emailQueueService *EmailQueueService,
+	promoService *PromoService,
 ) *AuthService {
 	return &AuthService{
 		userRepo:          userRepo,
@@ -70,16 +72,17 @@ func NewAuthService(
 		emailService:      emailService,
 		turnstileService:  turnstileService,
 		emailQueueService: emailQueueService,
+		promoService:      promoService,
 	}
 }

 // Register 用户注册，返回token和用户
 func (s *AuthService) Register(ctx context.Context, email, password string) (string, *User, error) {
-	return s.RegisterWithVerification(ctx, email, password, "")
+	return s.RegisterWithVerification(ctx, email, password, "", "")
 }

-// RegisterWithVerification 用户注册（支持邮件验证），返回token和用户
-func (s *AuthService) RegisterWithVerification(ctx context.Context, email, password, verifyCode string) (string, *User, error) {
+// RegisterWithVerification 用户注册（支持邮件验证和优惠码），返回token和用户
+func (s *AuthService) RegisterWithVerification(ctx context.Context, email, password, verifyCode, promoCode string) (string, *User, error) {
 	// 检查是否开放注册（默认关闭：settingService 未配置时不允许注册）
 	if s.settingService == nil || !s.settingService.IsRegistrationEnabled(ctx) {
 		return "", nil, ErrRegDisabled
@@ -150,6 +153,19 @@ func (s *AuthService) RegisterWithVerification(ctx context.Context, email, passw
 		return "", nil, ErrServiceUnavailable
 	}

+	// 应用优惠码（如果提供）
+	if promoCode != "" && s.promoService != nil {
+		if err := s.promoService.ApplyPromoCode(ctx, user.ID, promoCode); err != nil {
+			// 优惠码应用失败不影响注册，只记录日志
+			log.Printf("[Auth] Failed to apply promo code for user %d: %v", user.ID, err)
+		} else {
+			// 重新获取用户信息以获取更新后的余额
+			if updatedUser, err := s.userRepo.GetByID(ctx, user.ID); err == nil {
+				user = updatedUser
+			}
+		}
+	}
+
 	// 生成token
 	token, err := s.GenerateToken(user)
 	if err != nil {
--- a/backend/internal/service/domain_constants.go
+++ b/backend/internal/service/domain_constants.go
@@ -38,6 +38,12 @@ const (
 	RedeemTypeSubscription = "subscription"
 )

+// PromoCode status constants
+const (
+	PromoCodeStatusActive   = "active"
+	PromoCodeStatusDisabled = "disabled"
+)
+
 // Admin adjustment type constants
 const (
 	AdjustmentTypeAdminBalance     = "admin_balance"     // 管理员调整余额
--- a/backend/internal/service/promo_code.go
+++ b/backend/internal/service/promo_code.go
@@ -0,0 +1,73 @@
+package service
+
+import (
+	"time"
+)
+
+// PromoCode 注册优惠码
+type PromoCode struct {
+	ID          int64
+	Code        string
+	BonusAmount float64
+	MaxUses     int
+	UsedCount   int
+	Status      string
+	ExpiresAt   *time.Time
+	Notes       string
+	CreatedAt   time.Time
+	UpdatedAt   time.Time
+
+	// 关联
+	UsageRecords []PromoCodeUsage
+}
+
+// PromoCodeUsage 优惠码使用记录
+type PromoCodeUsage struct {
+	ID          int64
+	PromoCodeID int64
+	UserID      int64
+	BonusAmount float64
+	UsedAt      time.Time
+
+	// 关联
+	PromoCode *PromoCode
+	User      *User
+}
+
+// CanUse 检查优惠码是否可用
+func (p *PromoCode) CanUse() bool {
+	if p.Status != PromoCodeStatusActive {
+		return false
+	}
+	if p.ExpiresAt != nil && time.Now().After(*p.ExpiresAt) {
+		return false
+	}
+	if p.MaxUses > 0 && p.UsedCount >= p.MaxUses {
+		return false
+	}
+	return true
+}
+
+// IsExpired 检查是否已过期
+func (p *PromoCode) IsExpired() bool {
+	return p.ExpiresAt != nil && time.Now().After(*p.ExpiresAt)
+}
+
+// CreatePromoCodeInput 创建优惠码输入
+type CreatePromoCodeInput struct {
+	Code        string
+	BonusAmount float64
+	MaxUses     int
+	ExpiresAt   *time.Time
+	Notes       string
+}
+
+// UpdatePromoCodeInput 更新优惠码输入
+type UpdatePromoCodeInput struct {
+	Code        *string
+	BonusAmount *float64
+	MaxUses     *int
+	Status      *string
+	ExpiresAt   *time.Time
+	Notes       *string
+}
--- a/backend/internal/service/promo_code_repository.go
+++ b/backend/internal/service/promo_code_repository.go
@@ -0,0 +1,30 @@
+package service
+
+import (
+	"context"
+
+	"github.com/Wei-Shaw/sub2api/internal/pkg/pagination"
+)
+
+// PromoCodeRepository 优惠码仓储接口
+type PromoCodeRepository interface {
+	// 基础 CRUD
+	Create(ctx context.Context, code *PromoCode) error
+	GetByID(ctx context.Context, id int64) (*PromoCode, error)
+	GetByCode(ctx context.Context, code string) (*PromoCode, error)
+	GetByCodeForUpdate(ctx context.Context, code string) (*PromoCode, error) // 带行锁的查询，用于并发控制
+	Update(ctx context.Context, code *PromoCode) error
+	Delete(ctx context.Context, id int64) error
+
+	// 列表查询
+	List(ctx context.Context, params pagination.PaginationParams) ([]PromoCode, *pagination.PaginationResult, error)
+	ListWithFilters(ctx context.Context, params pagination.PaginationParams, status, search string) ([]PromoCode, *pagination.PaginationResult, error)
+
+	// 使用记录
+	CreateUsage(ctx context.Context, usage *PromoCodeUsage) error
+	GetUsageByPromoCodeAndUser(ctx context.Context, promoCodeID, userID int64) (*PromoCodeUsage, error)
+	ListUsagesByPromoCode(ctx context.Context, promoCodeID int64, params pagination.PaginationParams) ([]PromoCodeUsage, *pagination.PaginationResult, error)
+
+	// 计数操作
+	IncrementUsedCount(ctx context.Context, id int64) error
+}
--- a/backend/internal/service/promo_service.go
+++ b/backend/internal/service/promo_service.go
@@ -0,0 +1,256 @@
+package service
+
+import (
+	"context"
+	"crypto/rand"
+	"encoding/hex"
+	"fmt"
+	"strings"
+	"time"
+
+	dbent "github.com/Wei-Shaw/sub2api/ent"
+	infraerrors "github.com/Wei-Shaw/sub2api/internal/pkg/errors"
+	"github.com/Wei-Shaw/sub2api/internal/pkg/pagination"
+)
+
+var (
+	ErrPromoCodeNotFound    = infraerrors.NotFound("PROMO_CODE_NOT_FOUND", "promo code not found")
+	ErrPromoCodeExpired     = infraerrors.BadRequest("PROMO_CODE_EXPIRED", "promo code has expired")
+	ErrPromoCodeDisabled    = infraerrors.BadRequest("PROMO_CODE_DISABLED", "promo code is disabled")
+	ErrPromoCodeMaxUsed     = infraerrors.BadRequest("PROMO_CODE_MAX_USED", "promo code has reached maximum uses")
+	ErrPromoCodeAlreadyUsed = infraerrors.Conflict("PROMO_CODE_ALREADY_USED", "you have already used this promo code")
+	ErrPromoCodeInvalid     = infraerrors.BadRequest("PROMO_CODE_INVALID", "invalid promo code")
+)
+
+// PromoService 优惠码服务
+type PromoService struct {
+	promoRepo           PromoCodeRepository
+	userRepo            UserRepository
+	billingCacheService *BillingCacheService
+	entClient           *dbent.Client
+}
+
+// NewPromoService 创建优惠码服务实例
+func NewPromoService(
+	promoRepo PromoCodeRepository,
+	userRepo UserRepository,
+	billingCacheService *BillingCacheService,
+	entClient *dbent.Client,
+) *PromoService {
+	return &PromoService{
+		promoRepo:           promoRepo,
+		userRepo:            userRepo,
+		billingCacheService: billingCacheService,
+		entClient:           entClient,
+	}
+}
+
+// ValidatePromoCode 验证优惠码（注册前调用）
+// 返回 nil, nil 表示空码（不报错）
+func (s *PromoService) ValidatePromoCode(ctx context.Context, code string) (*PromoCode, error) {
+	code = strings.TrimSpace(code)
+	if code == "" {
+		return nil, nil // 空码不报错，直接返回
+	}
+
+	promoCode, err := s.promoRepo.GetByCode(ctx, code)
+	if err != nil {
+		// 保留原始错误类型，不要统一映射为 NotFound
+		return nil, err
+	}
+
+	if err := s.validatePromoCodeStatus(promoCode); err != nil {
+		return nil, err
+	}
+
+	return promoCode, nil
+}
+
+// validatePromoCodeStatus 验证优惠码状态
+func (s *PromoService) validatePromoCodeStatus(promoCode *PromoCode) error {
+	if !promoCode.CanUse() {
+		if promoCode.IsExpired() {
+			return ErrPromoCodeExpired
+		}
+		if promoCode.Status == PromoCodeStatusDisabled {
+			return ErrPromoCodeDisabled
+		}
+		if promoCode.MaxUses > 0 && promoCode.UsedCount >= promoCode.MaxUses {
+			return ErrPromoCodeMaxUsed
+		}
+		return ErrPromoCodeInvalid
+	}
+	return nil
+}
+
+// ApplyPromoCode 应用优惠码（注册成功后调用）
+// 使用事务和行锁确保并发安全
+func (s *PromoService) ApplyPromoCode(ctx context.Context, userID int64, code string) error {
+	code = strings.TrimSpace(code)
+	if code == "" {
+		return nil
+	}
+
+	// 开启事务
+	tx, err := s.entClient.Tx(ctx)
+	if err != nil {
+		return fmt.Errorf("begin transaction: %w", err)
+	}
+	defer func() { _ = tx.Rollback() }()
+
+	txCtx := dbent.NewTxContext(ctx, tx)
+
+	// 在事务中获取并锁定优惠码记录（FOR UPDATE）
+	promoCode, err := s.promoRepo.GetByCodeForUpdate(txCtx, code)
+	if err != nil {
+		return err
+	}
+
+	// 在事务中验证优惠码状态
+	if err := s.validatePromoCodeStatus(promoCode); err != nil {
+		return err
+	}
+
+	// 在事务中检查用户是否已使用过此优惠码
+	existing, err := s.promoRepo.GetUsageByPromoCodeAndUser(txCtx, promoCode.ID, userID)
+	if err != nil {
+		return fmt.Errorf("check existing usage: %w", err)
+	}
+	if existing != nil {
+		return ErrPromoCodeAlreadyUsed
+	}
+
+	// 增加用户余额
+	if err := s.userRepo.UpdateBalance(txCtx, userID, promoCode.BonusAmount); err != nil {
+		return fmt.Errorf("update user balance: %w", err)
+	}
+
+	// 创建使用记录
+	usage := &PromoCodeUsage{
+		PromoCodeID: promoCode.ID,
+		UserID:      userID,
+		BonusAmount: promoCode.BonusAmount,
+		UsedAt:      time.Now(),
+	}
+	if err := s.promoRepo.CreateUsage(txCtx, usage); err != nil {
+		return fmt.Errorf("create usage record: %w", err)
+	}
+
+	// 增加使用次数
+	if err := s.promoRepo.IncrementUsedCount(txCtx, promoCode.ID); err != nil {
+		return fmt.Errorf("increment used count: %w", err)
+	}
+
+	if err := tx.Commit(); err != nil {
+		return fmt.Errorf("commit transaction: %w", err)
+	}
+
+	// 失效余额缓存
+	if s.billingCacheService != nil {
+		go func() {
+			cacheCtx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+			defer cancel()
+			_ = s.billingCacheService.InvalidateUserBalance(cacheCtx, userID)
+		}()
+	}
+
+	return nil
+}
+
+// GenerateRandomCode 生成随机优惠码
+func (s *PromoService) GenerateRandomCode() (string, error) {
+	bytes := make([]byte, 8)
+	if _, err := rand.Read(bytes); err != nil {
+		return "", fmt.Errorf("generate random bytes: %w", err)
+	}
+	return strings.ToUpper(hex.EncodeToString(bytes)), nil
+}
+
+// Create 创建优惠码
+func (s *PromoService) Create(ctx context.Context, input *CreatePromoCodeInput) (*PromoCode, error) {
+	code := strings.TrimSpace(input.Code)
+	if code == "" {
+		// 自动生成
+		var err error
+		code, err = s.GenerateRandomCode()
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	promoCode := &PromoCode{
+		Code:        strings.ToUpper(code),
+		BonusAmount: input.BonusAmount,
+		MaxUses:     input.MaxUses,
+		UsedCount:   0,
+		Status:      PromoCodeStatusActive,
+		ExpiresAt:   input.ExpiresAt,
+		Notes:       input.Notes,
+	}
+
+	if err := s.promoRepo.Create(ctx, promoCode); err != nil {
+		return nil, fmt.Errorf("create promo code: %w", err)
+	}
+
+	return promoCode, nil
+}
+
+// GetByID 根据ID获取优惠码
+func (s *PromoService) GetByID(ctx context.Context, id int64) (*PromoCode, error) {
+	code, err := s.promoRepo.GetByID(ctx, id)
+	if err != nil {
+		return nil, err
+	}
+	return code, nil
+}
+
+// Update 更新优惠码
+func (s *PromoService) Update(ctx context.Context, id int64, input *UpdatePromoCodeInput) (*PromoCode, error) {
+	promoCode, err := s.promoRepo.GetByID(ctx, id)
+	if err != nil {
+		return nil, err
+	}
+
+	if input.Code != nil {
+		promoCode.Code = strings.ToUpper(strings.TrimSpace(*input.Code))
+	}
+	if input.BonusAmount != nil {
+		promoCode.BonusAmount = *input.BonusAmount
+	}
+	if input.MaxUses != nil {
+		promoCode.MaxUses = *input.MaxUses
+	}
+	if input.Status != nil {
+		promoCode.Status = *input.Status
+	}
+	if input.ExpiresAt != nil {
+		promoCode.ExpiresAt = input.ExpiresAt
+	}
+	if input.Notes != nil {
+		promoCode.Notes = *input.Notes
+	}
+
+	if err := s.promoRepo.Update(ctx, promoCode); err != nil {
+		return nil, fmt.Errorf("update promo code: %w", err)
+	}
+
+	return promoCode, nil
+}
+
+// Delete 删除优惠码
+func (s *PromoService) Delete(ctx context.Context, id int64) error {
+	if err := s.promoRepo.Delete(ctx, id); err != nil {
+		return fmt.Errorf("delete promo code: %w", err)
+	}
+	return nil
+}
+
+// List 获取优惠码列表
+func (s *PromoService) List(ctx context.Context, params pagination.PaginationParams, status, search string) ([]PromoCode, *pagination.PaginationResult, error) {
+	return s.promoRepo.ListWithFilters(ctx, params, status, search)
+}
+
+// ListUsages 获取使用记录
+func (s *PromoService) ListUsages(ctx context.Context, promoCodeID int64, params pagination.PaginationParams) ([]PromoCodeUsage, *pagination.PaginationResult, error) {
+	return s.promoRepo.ListUsagesByPromoCode(ctx, promoCodeID, params)
+}
--- a/backend/internal/service/wire.go
+++ b/backend/internal/service/wire.go
@@ -87,6 +87,7 @@ var ProviderSet = wire.NewSet(
 	NewAccountService,
 	NewProxyService,
 	NewRedeemService,
+	NewPromoService,
 	NewUsageService,
 	NewDashboardService,
 	ProvidePricingService,