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erio
64c4495ae5
Replace iframe-based external payment with native implementation: Backend (Go): - 5 new Ent schemas: PaymentOrder, PaymentAuditLog, PaymentChannel, SubscriptionPlan, PaymentProviderInstance - 5 SQL migrations (090-094) - Payment provider interface + registry + load balancer - 4 provider implementations (EasyPay, Alipay, WxPay, Stripe) - PaymentService (order lifecycle, fulfillment, refund 3-phase) - PaymentConfigService (settings, instance/channel/plan CRUD) - 31 API endpoints (9 user + 4 webhook + 18 admin) - Wire DI integration Frontend (Vue3): - Payment types, API modules, store, router changes - Sidebar: payment_enabled controls visibility, new menu items - User pages: PaymentView (replace iframe), QR payment, Stripe, result page, order list - Admin pages: Order management (4 tabs), provider instance mgmt - Settings: new payment tab, removed old purchase iframe config - i18n: full payment namespace (en + zh) Docs: - PAYMENT_FRONTEND_MIGRATION_PLAN.md - PAYMENT_BACKEND_MIGRATION_PLAN.md - PAYMENT_IMPLEMENTATION_ROADMAP.md
20 lines
714 B
Go
20 lines
714 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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// CalculatePayAmount computes the total pay amount given a recharge amount and
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// fee rate (percentage). Fee = amount * feeRate / 100, rounded UP (away from zero)
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// to 2 decimal places. The returned string is formatted to exactly 2 decimal places.
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// If feeRate <= 0, the amount is returned as-is (formatted to 2 decimal places).
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func CalculatePayAmount(rechargeAmount float64, feeRate float64) string {
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amount := decimal.NewFromFloat(rechargeAmount)
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if feeRate <= 0 {
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return amount.StringFixed(2)
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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(2)
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return amount.Add(fee).StringFixed(2)
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}
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