fix v2 gateway 表主键

src/main/java/au/com/royalpay/payment/manage/merchants/core/impls/ClientManagerImpl.java

@@ -3235,7 +3235,7 @@ public class ClientManagerImpl implements ClientManager, ManagerTodoNoticeProvid
         if (gatewaySignInfo == null) {
             JSONObject key = getRsaKey();
             gatewaySignInfo = new JSONObject();
-            gatewaySignInfo.put("client_moniker", client.getIntValue("client_moniker"));
+            gatewaySignInfo.put("client_moniker", client.getString("client_moniker"));
             gatewaySignInfo.put("platform_public_key", key.getString("public_key"));
             gatewaySignInfo.put("platform_private_key", key.getString("private_key"));
             gatewaySignInfo.put("is_valid", 0);