When a small program calls micro-channel pay payment interface returns appear: [] appid and mch_id not match the problem, record it. First check appid and mch_id there is no wrong, are generally replicate the past, it should be no problem. So this problem is a small number of businesses and programs no way binding or authorization, the solution is as follows:
小程序开通支付并绑定商户号（在小程序后台微信支付模块按提示操作即可）
商户号对小程序绑定授权（产品中心-APPID授权管理，另外，如果是公众号还需在开发配置中配置支付授权目录）
