WeChat.Template.api_set_industry

You're seeing just the function api_set_industry, go back to WeChat.Template module for more information.
Link to this function

api_set_industry(client, industry_id1, industry_id2)

Specs

api_set_industry(WeChat.client(), industry_id(), industry_id()) ::
  WeChat.response()

设置所属行业 - 官方文档

每月可修改行业1次,帐号仅可使用所属行业中相关的模板