feat: implement automatic fallback from QRIS to QRISC in tripay service

services/tripay.go

@@ -123,29 +123,7 @@ func CreateTripayTransaction(
 		proxyURLStr = config.GlobalConfig.TripayProxyURL
 	}
 
-	// Hitung signature
-	signature := CalculateSignature(orderNumber, amount, mCode, privKey)
-
-	// Persiapkan payload request
-	payload := TripayCreateRequest{
-		Method:        paymentMethod,
-		MerchantRef:   orderNumber,
-		Amount:        amount,
-		CustomerName:  customerName,
-		CustomerEmail: customerEmail,
-		CustomerPhone: customerPhone,
-		OrderItems:    items,
-		Signature:     signature,
-	}
-
-	jsonBytes, err := json.Marshal(payload)
-	if err != nil {
-		return nil, fmt.Errorf("gagal merancang payload Tripay: %v", err)
-	}
-
-	apiURL := getTripayBaseURL() + "/transaction/create"
-	log.Printf("[TRIPAY] Mengirim request tagihan ke: %s (CompanyID=%d)", apiURL, companyID)
-
+	// Persiapkan proxy transport
 	transport := &http.Transport{}
 	if proxyURLStr != "" {
 		proxyURL, err := url.Parse(proxyURLStr)
@@ -161,42 +139,91 @@ func CreateTripayTransaction(
 		Transport: transport,
 		Timeout:   15 * time.Second,
 	}
-	req, err := http.NewRequest("POST", apiURL, bytes.NewBuffer(jsonBytes))
-	if err != nil {
-		return nil, fmt.Errorf("gagal membuat http request: %v", err)
+
+	// Buat daftar metode pembayaran yang akan dicoba (jika default QRIS, tambahkan QRISC sebagai fallback otomatis)
+	methodsToTry := []string{paymentMethod}
+	if paymentMethod == "QRIS" {
+		methodsToTry = append(methodsToTry, "QRISC")
 	}
 
-	// Atur headers
-	req.Header.Set("Content-Type", "application/json")
-	req.Header.Set("Authorization", "Bearer "+apiKey)
+	var lastError error
+	var tripayResp TripayCreateResponse
 
-	resp, err := client.Do(req)
-	if err != nil {
-		return nil, fmt.Errorf("koneksi HTTP ke Tripay gagal: %v", err)
-	}
-	defer resp.Body.Close()
+	for _, currentMethod := range methodsToTry {
+		// Hitung signature (sama untuk semua method karena rumusnya hanya: merchantCode + merchantRef + amount)
+		signature := CalculateSignature(orderNumber, amount, mCode, privKey)
+
+		// Persiapkan payload request
+		payload := TripayCreateRequest{
+			Method:        currentMethod,
+			MerchantRef:   orderNumber,
+			Amount:        amount,
+			CustomerName:  customerName,
+			CustomerEmail: customerEmail,
+			CustomerPhone: customerPhone,
+			OrderItems:    items,
+			Signature:     signature,
+		}
 
-	bodyBytes, err := io.ReadAll(resp.Body)
-	if err != nil {
-		return nil, fmt.Errorf("gagal membaca response body Tripay: %v", err)
-	}
+		jsonBytes, err := json.Marshal(payload)
+		if err != nil {
+			return nil, fmt.Errorf("gagal merancang payload Tripay: %v", err)
+		}
 
-	if resp.StatusCode != http.StatusOK && resp.StatusCode != http.StatusCreated {
-		log.Printf("[TRIPAY] Response error: Status=%d, Body=%s", resp.StatusCode, string(bodyBytes))
-		return nil, fmt.Errorf("tripay mengembalikan status error %d", resp.StatusCode)
-	}
+		apiURL := getTripayBaseURL() + "/transaction/create"
+		log.Printf("[TRIPAY] Mengirim request tagihan ke: %s (Method=%s, CompanyID=%d)", apiURL, currentMethod, companyID)
 
-	var tripayResp TripayCreateResponse
-	if err := json.Unmarshal(bodyBytes, &tripayResp); err != nil {
-		return nil, fmt.Errorf("gagal parse JSON response Tripay: %v", err)
-	}
+		req, err := http.NewRequest("POST", apiURL, bytes.NewBuffer(jsonBytes))
+		if err != nil {
+			return nil, fmt.Errorf("gagal membuat http request: %v", err)
+		}
+
+		// Atur headers
+		req.Header.Set("Content-Type", "application/json")
+		req.Header.Set("Authorization", "Bearer "+apiKey)
+
+		resp, err := client.Do(req)
+		if err != nil {
+			lastError = fmt.Errorf("koneksi HTTP ke Tripay gagal: %v", err)
+			continue
+		}
+
+		bodyBytes, err := io.ReadAll(resp.Body)
+		resp.Body.Close()
+		if err != nil {
+			lastError = fmt.Errorf("gagal membaca response body Tripay: %v", err)
+			continue
+		}
+
+		if resp.StatusCode != http.StatusOK && resp.StatusCode != http.StatusCreated {
+			log.Printf("[TRIPAY] Response error: Status=%d, Body=%s", resp.StatusCode, string(bodyBytes))
+			
+			// Ambil deskripsi error untuk dicatat ke lastError
+			var errorResp struct {
+				Success bool   `json:"success"`
+				Message string `json:"message"`
+			}
+			_ = json.Unmarshal(bodyBytes, &errorResp)
+			
+			lastError = fmt.Errorf("tripay mengembalikan status error %d: %s", resp.StatusCode, errorResp.Message)
+			continue
+		}
+
+		if err := json.Unmarshal(bodyBytes, &tripayResp); err != nil {
+			lastError = fmt.Errorf("gagal parse JSON response Tripay: %v", err)
+			continue
+		}
+
+		if !tripayResp.Success {
+			lastError = fmt.Errorf("tripay gagal memproses: %s", tripayResp.Message)
+			continue
+		}
 
-	if !tripayResp.Success {
-		return nil, fmt.Errorf("tripay gagal memproses: %s", tripayResp.Message)
+		log.Printf("[TRIPAY] Sukses membuat transaksi dengan Method=%s! Ref=%s, URL=%s", currentMethod, tripayResp.Data.Reference, tripayResp.Data.CheckoutURL)
+		return &tripayResp, nil
 	}
 
-	log.Printf("[TRIPAY] Sukses membuat transaksi! Ref=%s, URL=%s", tripayResp.Data.Reference, tripayResp.Data.CheckoutURL)
-	return &tripayResp, nil
+	return nil, lastError
 }
 
 // VerifyTripaySignature memvalidasi keaslian callback webhook dari Tripay