WeChat.SubscribeMessage.delete_template

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

delete_template(client, pri_tmpl_id)

Specs

delete_template(WeChat.client(), pri_tmpl_id()) :: WeChat.response()

删除帐号下的个人模板 - 官方文档