微信支付回调返回的参数(POST)
Wechatpay-Serial(header)
Wechatpay-Signature(header)
Wechatpay-Timestamp(header)
Wechatpay-Nonce(header)
主体(body)
验证签名
$verify=$smpw->_sign_verify([$timestamp, $nonce, $body], $signature);
if ($verify==1){
echo 'ok';
}else echo 'failure';
/**
* 支付回调(验证签名
* @par...