diff --git a/includes/class-yoone-moneris-api.php b/includes/class-yoone-moneris-api.php
index 3722bab..54b2c01 100644
--- a/includes/class-yoone-moneris-api.php
+++ b/includes/class-yoone-moneris-api.php
@@ -91,7 +91,8 @@ class Yoone_Moneris_API implements Yoone_Moneris_API_Interface {
         $num = isset($card['number']) ? preg_replace('/\D+/', '', (string) $card['number']) : '';
         $masked = $num ? str_repeat('*', max(strlen($num) - 4, 0)) . substr($num, -4) : '';
         error_log('【Yoone Moneris API】tokenize_card 请求：last4=' . ($num ? substr($num, -4) : '') . ' len=' . strlen($num) . ' expdate=' . $payload['expdate'] . ' cryptType=' . $payload['cryptType']);
-        $res = $this->send_moneris_xml( 'res_add_cc', $payload );
+        // 使用集中加载的交易类型常量接口
+        $res = $this->send_moneris_xml( Yoone_Moneris_Txn_Types::RES_ADD_CC, $payload );
         error_log('$res11111111'. print_r($res, true));
         if ( $res['ok'] ) {
             return array(
@@ -126,7 +127,8 @@ class Yoone_Moneris_API implements Yoone_Moneris_API_Interface {
             require_once __DIR__ . '/utils/orderid.php';
         }
         $unique_order_id = yoone_moneris_unique_order_id( $order_id );
-        $type = $capture ? 'res_purchase_cc' : 'res_preauth_cc';
+        // 使用集中加载的交易类型常量接口
+        $type = $capture ? Yoone_Moneris_Txn_Types::RES_PURCHASE_CC : Yoone_Moneris_Txn_Types::RES_PREAUTH_CC;
         $payload = array(
             'dataKey'   => (string) $token,
             'orderId'   => (string) $unique_order_id,
@@ -185,7 +187,8 @@ class Yoone_Moneris_API implements Yoone_Moneris_API_Interface {
             'amount'    => $this->format_amount( $amount ),
             'cryptType' => $this->crypt_type,
         );
-        $res = $this->send_moneris_xml( 'refund', $payload );
+        // 使用集中加载的交易类型常量接口
+        $res = $this->send_moneris_xml( Yoone_Moneris_Txn_Types::REFUND, $payload );
         if ( $res['ok'] ) {
             return array( 'success' => true );
         }
@@ -214,9 +217,14 @@ class Yoone_Moneris_API implements Yoone_Moneris_API_Interface {
 
         // 构建请求体
         $body = array(
-            'storeId'    => $this->store_id,
-            'apiToken'   => $this->api_token,
-            'statusCheck'=> (bool) $this->status_check,
+            'storeId'                => $this->store_id,
+            'apiToken'               => $this->api_token,
+            // 明确发送字符串 true/false，避免 boolean false 被序列化为空字符串
+            'statusCheck'            => $this->status_check ? 'true' : 'false',
+            // 添加处理国家代码（CA/US），与端点匹配
+            'processingCountryCode'  => strtoupper($this->country_code),
+            // 在沙箱环境显式声明 test=true（与官方示例一致）
+            'test'                   => $this->is_test_mode() ? 'true' : 'false',
         );
 
         // 风险查询特殊结构（暂不支持；如需支持可扩展）
diff --git a/includes/interfaces/class-yoone-moneris-txn-types.php b/includes/interfaces/class-yoone-moneris-txn-types.php
new file mode 100644
index 0000000..63bfcaa
--- /dev/null
+++ b/includes/interfaces/class-yoone-moneris-txn-types.php
@@ -0,0 +1,23 @@
+<?php
+if (! defined('ABSPATH')) {
+    exit;
+}
+
+/**
+ * 交易类型常量枚举（避免字符串写错）
+ * 将常用的交易类型统一到接口常量中，供 API 层调用。
+ */
+interface Yoone_Moneris_Txn_Types
+{
+    // Vault（存储卡片）相关
+    public const RES_ADD_CC      = 'res_add_cc';
+    public const RES_UPDATE_CC   = 'res_update_cc';
+    public const RES_DELETE      = 'res_delete';
+
+    // Vault 令牌交易
+    public const RES_PURCHASE_CC = 'res_purchase_cc';
+    public const RES_PREAUTH_CC  = 'res_preauth_cc';
+
+    // 通用交易
+    public const REFUND          = 'refund';
+}
\ No newline at end of file
diff --git a/yoone-moneris-payments.php b/yoone-moneris-payments.php
index 4f6a526..c7b26e1 100644
--- a/yoone-moneris-payments.php
+++ b/yoone-moneris-payments.php
@@ -40,6 +40,8 @@ function yoone_moneris_payments_init() {
     // __DIR__ 是当前文件所在目录，拼接 includes 路径以找到类定义文件。
     require_once __DIR__ . '/includes/constants/moneris.php';
     require_once __DIR__ . '/includes/interfaces/class-yoone-moneris-api-interface.php';
+    // 加载交易类型常量接口，统一交易类型字符串，避免在使用处多次 require
+    require_once __DIR__ . '/includes/interfaces/class-yoone-moneris-txn-types.php';
     require_once __DIR__ . '/includes/utils/logger.php';
     require_once __DIR__ . '/includes/class-yoone-moneris-api.php';
     require_once __DIR__ . '/includes/class-yoone-gateway-moneris.php';