22 lines
799 B
Go
22 lines
799 B
Go
package payment
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import (
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"github.com/shopspring/decimal"
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)
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func CalculatePayAmount(rechargeAmount float64, feeRate float64) string {
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return CalculatePayAmountForCurrency(rechargeAmount, feeRate, DefaultPaymentCurrency)
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}
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// CalculatePayAmountForCurrency 按币种精度计算应付金额，手续费向上取整到该币种最小支付单位。
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func CalculatePayAmountForCurrency(rechargeAmount float64, feeRate float64, currency string) string {
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fractionDigits := int32(CurrencyMaxFractionDigits(currency))
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amount := decimal.NewFromFloat(rechargeAmount)
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if feeRate <= 0 {
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return amount.StringFixed(fractionDigits)
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}
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rate := decimal.NewFromFloat(feeRate)
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fee := amount.Mul(rate).Div(decimal.NewFromInt(100)).RoundUp(fractionDigits)
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return amount.Add(fee).StringFixed(fractionDigits)
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}
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