feat: add wechat pay

backend/providers/pay/wechat.go

@@ -0,0 +1,49 @@
+package pay
+
+import (
+	"context"
+	"errors"
+	"time"
+
+	"github.com/go-pay/gopay"
+	"github.com/go-pay/gopay/wechat/v3"
+)
+
+// get js pay prepay id
+func (client *Client) WeChat_JSApiPayRequest(ctx context.Context, payerOpenID, orderNo, title string, price, amount int64, notifyUrl string) (*wechat.JSAPIPayParams, error) {
+	expire := time.Now().Add(10 * time.Minute).Format(time.RFC3339)
+	// 初始化 BodyMap
+	bm := make(gopay.BodyMap)
+
+	bm.
+		Set("sp_appid", client.conf.WeChat.AppId).
+		Set("sp_mchid", client.conf.WeChat.MechID).
+		Set("sub_mchid", client.conf.WeChat.SubMechID).
+		Set("description", title).
+		Set("out_trade_no", orderNo).
+		Set("time_expire", expire).
+		Set("notify_url", notifyUrl).
+		SetBodyMap("amount", func(bm gopay.BodyMap) {
+			if amount == 0 {
+				amount = 1
+			}
+
+			bm.
+				Set("total", amount).
+				Set("currency", "CNY")
+		}).
+		SetBodyMap("payer", func(bm gopay.BodyMap) {
+			bm.Set("sp_openid", payerOpenID)
+		})
+
+	resp, err := client.WeChat.V3TransactionJsapi(ctx, bm)
+	if err != nil {
+		return nil, err
+	}
+
+	if resp.Code != 0 {
+		return nil, errors.New("获取预支付ID失败")
+	}
+
+	return client.WeChat.PaySignOfJSAPI(client.conf.WeChat.AppId, resp.Response.PrepayId)
+}