How to realize the function of Mini Program plus WeChat group on the same journey?

< H2 > how to realize the function of Mini Program plus WeChat group on the same trip? < / H2 >

after buying a ticket in Mini Program on the same trip,
can jump to Mini Program on the same ride. Mini Program joins the WeChat group through customer service, and the user joins the WeChat group.
how to achieve this function:
how to let users join Wechat group chat in Mini Program?

1. Prompt to join the chat room

2.

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3.

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e3f2d0-4354d.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e3f2d0-4354d.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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