客服账号前缀怎么和客服微信号对应起来

https://developers.weixin.qq.com/doc/offiaccount/Customer_Service/Obtain_chat_transcript.html

worker完整客服帐号，格式为：帐号前缀@公众号微信号。这个客服账号前缀怎么和客服微信号对应起来