WeChat.CardManaging.get_card_bizuin_info

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

get_card_bizuin_info(client, begin_date, end_date, cond_source \\ 1)

Specs

get_card_bizuin_info(
  WeChat.client(),
  begin_date :: WeChat.Card.date(),
  end_date :: WeChat.Card.date(),
  WeChat.Card.cond_source()
) :: WeChat.response()

拉取卡券概况数据 - 官方文档