diff --git a/orders/views/payment.py b/orders/views/payment.py
index 8a2e58a..a1a1a84 100644
--- a/orders/views/payment.py
+++ b/orders/views/payment.py
@@ -1441,6 +1441,7 @@ class CreateOrderView(APIView):
 
                 sorted_pay_sign_data = sorted(pay_sign_data.items(), key=lambda x: x[0])
                 pay_sign_string = '&'.join([f"{key}={value}" for key, value in sorted_pay_sign_data])
+                string_a = pay_sign_string  # 无 key，供诊断页核对
                 pay_sign_string += f'&key={KEY}'
                 pay_sign = hashlib.md5(pay_sign_string.encode('utf-8')).hexdigest().upper()
 
@@ -1461,6 +1462,9 @@ class CreateOrderView(APIView):
                         'openid_preview': _oid_preview,
                         'openid_len': len(openid or ''),
                         'key_source': str(pay_cfg.get('_key_source') or ''),
+                        'key_len': len(KEY or ''),
+                        'string_a': string_a,
+                        'paySign_preview': pay_sign[:8],
                     },
                 }
 
diff --git a/templates/wechat/h5_jsapi_pay.html b/templates/wechat/h5_jsapi_pay.html
index a1f9f3e..c249486 100644
--- a/templates/wechat/h5_jsapi_pay.html
+++ b/templates/wechat/h5_jsapi_pay.html
@@ -201,7 +201,9 @@
             package: pay.package,
             openid_preview: diag.openid_preview,
             mch_id: diag.mch_id,
-            key_source: diag.key_source
+            key_source: diag.key_source,
+            key_len: diag.key_len,
+            string_a: diag.string_a || '(无)'
         });
     } else {
         try {
@@ -334,17 +336,17 @@
                     push('oauth_openid', SERVER_OID || '(无)');
                     push('关键：秒关时屏幕是否出现「当前页面的URL未注册」？有=目录问题；无=把本页绿日志发回');
                     if (quick) {
-                        setTip('<span class="err">微信秒关 cancel</span><br/>请确认是否闪过「URL未注册」灰字，并把绿日志复制发回', true);
+                        setTip('<span class="err">微信秒关 cancel</span><br/>请看清闪过的灰字：URL未注册 / 支付验证签名失败 / 什么都没有', true);
                         try {
                             alert(
-                                '支付秒关 cancel\n\n' +
-                                'mch_id=' + ((diag && diag.mch_id) || '?') + '\n' +
+                                '支付秒关 cancel（约' + costMs + 'ms）\n\n' +
+                                '请务必看清闪过的提示（三选一回复我）：\n' +
+                                'A. 当前页面的URL未注册\n' +
+                                'B. 支付验证签名失败\n' +
+                                'C. 什么字都没有 / 只闪一下\n\n' +
+                                'mch=' + ((diag && diag.mch_id) || '?') + '\n' +
                                 'appId=' + appId + '\n' +
-                                '来源=' + PAY_SOURCE + '\n' +
-                                'openid=' + (SERVER_OID || '?') + '\n' +
-                                'URL=' + checkUrl + '\n' +
-                                'ms=' + costMs + '\n\n' +
-                                '请问：有没有灰字「当前页面的URL未注册」？'
+                                'URL=' + checkUrl
                             );
                         } catch (e) {}
                     } else {