feat(api): change subscription product options and catalog endpoints to use GET method

controller/topup_waffo_pancake.go

@@ -103,11 +103,6 @@ func getWaffoPancakeBuyerEmail(user *model.User) string {
 // the body and fall back to persisted creds when the body is blank (see
 // resolveWaffoPancakeAdminCreds). Only SaveWaffoPancake writes to OptionMap.
 
-type waffoPancakeCredsRequest struct {
-	MerchantID string `json:"merchant_id"`
-	PrivateKey string `json:"private_key"`
-}
-
 type saveWaffoPancakeRequest struct {
 	MerchantID string `json:"merchant_id"`
 	PrivateKey string `json:"private_key"`
@@ -221,15 +216,11 @@ func CreateWaffoPancakePair(c *gin.Context) {
 // Doubles as a credential probe (a successful 200 proves the resolved creds
 // authenticate). See resolveWaffoPancakeAdminCreds for credential resolution.
 func ListWaffoPancakeCatalog(c *gin.Context) {
-	var req waffoPancakeCredsRequest
-	// An empty body means "use persisted creds"; only fail on malformed JSON.
-	if c.Request.ContentLength > 0 {
-		if err := c.ShouldBindJSON(&req); err != nil {
-			c.JSON(http.StatusOK, gin.H{"message": "error", "data": "参数错误"})
-			return
-		}
-	}
-	merchantID, privateKey := resolveWaffoPancakeAdminCreds(req.MerchantID, req.PrivateKey)
+	// Missing query creds mean "use persisted creds".
+	merchantID, privateKey := resolveWaffoPancakeAdminCreds(
+		strings.TrimSpace(c.Query("merchant_id")),
+		strings.TrimSpace(c.Query("private_key")),
+	)
 	if merchantID == "" || privateKey == "" {
 		c.JSON(http.StatusOK, gin.H{"message": "error", "data": "Waffo Pancake 凭证未配置"})
 		return