feat(payment): add complete payment system with multi-provider support

Add a full payment and subscription system supporting EasyPay (Alipay/WeChat),
Stripe, and direct Alipay/WeChat Pay providers with multi-instance load balancing.

backend/ent/paymentproviderinstance/paymentproviderinstance.go

@@ -0,0 +1,160 @@
+// Code generated by ent, DO NOT EDIT.
+
+package paymentproviderinstance
+
+import (
+	"time"
+
+	"entgo.io/ent/dialect/sql"
+)
+
+const (
+	// Label holds the string label denoting the paymentproviderinstance type in the database.
+	Label = "payment_provider_instance"
+	// FieldID holds the string denoting the id field in the database.
+	FieldID = "id"
+	// FieldProviderKey holds the string denoting the provider_key field in the database.
+	FieldProviderKey = "provider_key"
+	// FieldName holds the string denoting the name field in the database.
+	FieldName = "name"
+	// FieldConfig holds the string denoting the config field in the database.
+	FieldConfig = "config"
+	// FieldSupportedTypes holds the string denoting the supported_types field in the database.
+	FieldSupportedTypes = "supported_types"
+	// FieldEnabled holds the string denoting the enabled field in the database.
+	FieldEnabled = "enabled"
+	// FieldPaymentMode holds the string denoting the payment_mode field in the database.
+	FieldPaymentMode = "payment_mode"
+	// FieldSortOrder holds the string denoting the sort_order field in the database.
+	FieldSortOrder = "sort_order"
+	// FieldLimits holds the string denoting the limits field in the database.
+	FieldLimits = "limits"
+	// FieldRefundEnabled holds the string denoting the refund_enabled field in the database.
+	FieldRefundEnabled = "refund_enabled"
+	// FieldCreatedAt holds the string denoting the created_at field in the database.
+	FieldCreatedAt = "created_at"
+	// FieldUpdatedAt holds the string denoting the updated_at field in the database.
+	FieldUpdatedAt = "updated_at"
+	// Table holds the table name of the paymentproviderinstance in the database.
+	Table = "payment_provider_instances"
+)
+
+// Columns holds all SQL columns for paymentproviderinstance fields.
+var Columns = []string{
+	FieldID,
+	FieldProviderKey,
+	FieldName,
+	FieldConfig,
+	FieldSupportedTypes,
+	FieldEnabled,
+	FieldPaymentMode,
+	FieldSortOrder,
+	FieldLimits,
+	FieldRefundEnabled,
+	FieldCreatedAt,
+	FieldUpdatedAt,
+}
+
+// ValidColumn reports if the column name is valid (part of the table columns).
+func ValidColumn(column string) bool {
+	for i := range Columns {
+		if column == Columns[i] {
+			return true
+		}
+	}
+	return false
+}
+
+var (
+	// ProviderKeyValidator is a validator for the "provider_key" field. It is called by the builders before save.
+	ProviderKeyValidator func(string) error
+	// DefaultName holds the default value on creation for the "name" field.
+	DefaultName string
+	// NameValidator is a validator for the "name" field. It is called by the builders before save.
+	NameValidator func(string) error
+	// DefaultSupportedTypes holds the default value on creation for the "supported_types" field.
+	DefaultSupportedTypes string
+	// SupportedTypesValidator is a validator for the "supported_types" field. It is called by the builders before save.
+	SupportedTypesValidator func(string) error
+	// DefaultEnabled holds the default value on creation for the "enabled" field.
+	DefaultEnabled bool
+	// DefaultPaymentMode holds the default value on creation for the "payment_mode" field.
+	DefaultPaymentMode string
+	// PaymentModeValidator is a validator for the "payment_mode" field. It is called by the builders before save.
+	PaymentModeValidator func(string) error
+	// DefaultSortOrder holds the default value on creation for the "sort_order" field.
+	DefaultSortOrder int
+	// DefaultLimits holds the default value on creation for the "limits" field.
+	DefaultLimits string
+	// DefaultRefundEnabled holds the default value on creation for the "refund_enabled" field.
+	DefaultRefundEnabled bool
+	// DefaultCreatedAt holds the default value on creation for the "created_at" field.
+	DefaultCreatedAt func() time.Time
+	// DefaultUpdatedAt holds the default value on creation for the "updated_at" field.
+	DefaultUpdatedAt func() time.Time
+	// UpdateDefaultUpdatedAt holds the default value on update for the "updated_at" field.
+	UpdateDefaultUpdatedAt func() time.Time
+)
+
+// OrderOption defines the ordering options for the PaymentProviderInstance queries.
+type OrderOption func(*sql.Selector)
+
+// ByID orders the results by the id field.
+func ByID(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldID, opts...).ToFunc()
+}
+
+// ByProviderKey orders the results by the provider_key field.
+func ByProviderKey(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldProviderKey, opts...).ToFunc()
+}
+
+// ByName orders the results by the name field.
+func ByName(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldName, opts...).ToFunc()
+}
+
+// ByConfig orders the results by the config field.
+func ByConfig(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldConfig, opts...).ToFunc()
+}
+
+// BySupportedTypes orders the results by the supported_types field.
+func BySupportedTypes(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldSupportedTypes, opts...).ToFunc()
+}
+
+// ByEnabled orders the results by the enabled field.
+func ByEnabled(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldEnabled, opts...).ToFunc()
+}
+
+// ByPaymentMode orders the results by the payment_mode field.
+func ByPaymentMode(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldPaymentMode, opts...).ToFunc()
+}
+
+// BySortOrder orders the results by the sort_order field.
+func BySortOrder(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldSortOrder, opts...).ToFunc()
+}
+
+// ByLimits orders the results by the limits field.
+func ByLimits(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldLimits, opts...).ToFunc()
+}
+
+// ByRefundEnabled orders the results by the refund_enabled field.
+func ByRefundEnabled(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldRefundEnabled, opts...).ToFunc()
+}
+
+// ByCreatedAt orders the results by the created_at field.
+func ByCreatedAt(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldCreatedAt, opts...).ToFunc()
+}
+
+// ByUpdatedAt orders the results by the updated_at field.
+func ByUpdatedAt(opts ...sql.OrderTermOption) OrderOption {
+	return sql.OrderByField(FieldUpdatedAt, opts...).ToFunc()
+}