Openid cannot be found after WeChat payment refresh

{Code...} refresh or error return prompt: the required parameter openid is missing in the unified payment interface! When trade_type is JSAPI, openid is a required parameter!

If (! Isset ($ _ GET ['code']) {// return code $ url = $ jsApi-> createOauthUrlForCode (WxPayConf_pub: JS_API_CALL_URL); Header ("Location: $ url ") ;}else {// GET the code to GET openid $ code =$ _ GET ['code']; $ jsApi-> setCode ($ code ); $ openid = $ jsApi-> getOpenId () ;}$ unifiedOrder-> setParameter ("openid", "$ openid ");

Refresh or error response prompt:

Required parameters are missing in the unified payment Interfaceopenid!trade_typeIsJSAPI,openidRequired parameter!

Reply content:

If (! Isset ($ _ GET ['code']) {// return code $ url = $ jsApi-> createOauthUrlForCode (WxPayConf_pub: JS_API_CALL_URL); Header ("Location: $ url ") ;}else {// GET the code to GET openid $ code =$ _ GET ['code']; $ jsApi-> setCode ($ code ); $ openid = $ jsApi-> getOpenId () ;}$ unifiedOrder-> setParameter ("openid", "$ openid ");

Refresh or error response prompt:

Required parameters are missing in the unified payment Interfaceopenid!trade_typeIsJSAPI,openidRequired parameter!

The first step of the subject has completed Oauth authentication.
Is the link that can get the openid... TX jump isXXXX.com&code=123
Then Exchange code for openid ..
Code. If the life cycle is not used, it takes only 5 minutes.
The process of the subject directly produces the prepay_id display payment page ..