* 支付回调 - 签名验证码校对 | 传入参 | 说明 | | --- | --- | | data | \[ 必填 \] 微信订单数组 | | 回调参 | 说明 | | --- | --- | | appid | | | bank_type | | | cash_fee | | | fee_type | | | is_subscribe | | | mch_id | | | nonce_str | | | openid | | | out_trade_no | | | result_code | | | return_code | | | sign | | | time_end | | | total_fee | | | trade_type | | | transaction_id | | * 案例 ~~~ $back_sign = $WX_applet->back_sign($data); ~~~