BUGFIX: 返回最新的订阅号

src/main/java/com/ai/da/common/utils/SendEmailUtil.java

@@ -1012,7 +1012,7 @@ public class SendEmailUtil {
             template.setTemplateID(CREDITS_PURCHASE_MERCHANT);
             JSONObject jsonObject = new JSONObject();
             // 设置试用订单相关数据
-            jsonObject.put("userName", username);
+            jsonObject.put("username", username);
             jsonObject.put("quantity", quantity);
             jsonObject.put("totalFee", amount);