上一篇文章我们说了小微商户的进件功能，这篇文章来看一看 微信JSAPI合单支付
要在微信中通过JSAPI调起支付，需要在服务端与微信通信，服务端把订单信息发送给微信服务器，然后微信服务器会生成一个预支付订单的标识返回给我们，我们拿到这个预支付订单的标识，再去通过js调起微信支付。
php服务器端代码：
//下单请求微信 微信返回 prepay_id
public function goPayJs(){
$ip=$this->getIP();//获取IP方法，见下文
$order_sn=date("YmdHis").rand(10000,99999);//自定义一个支付订单号
$info=array(//订单信息
"combine_out_trade_no" => $order_sn,//合单支付总订单号
"combine_mchid" => "123456789",//服务商的商户号
"combine_appid" => "wx1234567890",//合单发起方的appid
"scene_info" => array(
"payer_client_ip" => $ip,//用户端实际ip
),
"sub_orders" => array(//子订单，最多支持50个
array(
"mchid" => "123456789",//服务商的商户号，
"attach" => "日用杂货店",//附加数据，在查询API和支付通知中原样返回，可作为自定义参数使用。
"amount" => array(//支付信息
"total_amount" =>1,//支付金额 单位为分 int类型
"currency" =>"CNY"//币种 CNY人民币
),
"out_trade_no" => "2020".time(),//自定义子单订单号
"sub_mchid" => "123123123",//二级商户的商户号
"description" => "府周店-日用杂货店"//描述
)
),
"combine_payer_info" =>array(//支付用户的信息
"openid"=>"FWEFWE324234G3443G34G" //支付用户的 微信openid
),
"notify_url" => "https://www.baidu.com/" //支付回调地址 支付成功后 微信通知你服务器的地址
);
$json=json_encode($info);
$url="https://api.mch.weixin.qq.com/v3/combine-transactions/jsapi";
$timeStamp=time();//时间戳
$nonce=$this->nonce_str();//获取一个随机字符串
$mch_private_key=$this->getPublicKey();//读取商户api证书公钥 getPublicKey()获取方法 见下文
$merchant_id='123456789';//服务商商户号
$serial_no='123123SJDFOWJEO23J32I23J2J3LJ';//商户证书序列号
$sign=$this->sign($url,'POST',$timeStamp,$nonce,$json,$mch_private_key,$merchant_id,$serial_no);//签名
$header=[
'Authorization:WECHATPAY2-SHA256-RSA2048 '.$sign,
'Accept:application/json',
'User-Agent:'.$merchant_id,
'Content-Type:application/json',
];
$result=$this->curl($url,$json,$header,'POST');
$result=json_decode($result,true);
//$result['prepay_id']微信返回的 预支付订单的标识
$prepayID="prepay_id=".$result['prepay_id'];//字符串拼接
$key="微信证书v3 32位密钥字符串"; //微信证书v3密钥 在微信商户平台 API安全中设置的
$qianming=$this->signJS("wx1234567890",$timeStamp,$nonce,$prepayID,$mch_private_key);//二次签名
//一下几个参数需要传到前端 js中使用
$data['time'] = $timeStamp;//上文生成的时间戳
$data['nonce'] = $nonce;//上文生成的随机字符串
$data['prepay_id'] = $result['prepay_id'];//微信返回的预支付订单标识
$data['sign'] = $qianming;//二次签名
$data['appid'] = "wx1234567890";//商户的appid
}
//获取IP
private function getIP(){
if (@$_SERVER["HTTP_X_FORWARDED_FOR"])
$ip = $_SERVER["HTTP_X_FORWARDED_FOR"];
else if (@$_SERVER["HTTP_CLIENT_IP"])
$ip = $_SERVER["HTTP_CLIENT_IP"];
else if (@$_SERVER["REMOTE_ADDR"])
$ip = $_SERVER["REMOTE_ADDR"];
else if (@getenv("HTTP_X_FORWARDED_FOR"))
$ip = getenv("HTTP_X_FORWARDED_FOR");
else if (@getenv("HTTP_CLIENT_IP"))
$ip = getenv("HTTP_CLIENT_IP");
else if (@getenv("REMOTE_ADDR"))
$ip = getenv("REMOTE_ADDR");
else
$ip = "Unknown";
return $ip;
}
//生成随机字符串
public function nonce_str($length=32){
$chars = "abcdefghijklmnopqrstuvwxyz0123456789";
$str ="";
for ( $i = 0; $i < $length; $i++ ) {
$str.= substr($chars, mt_rand(0, strlen($chars)-1), 1);
}
return $str;
}
//读取商户api证书公钥
public function getPublicKey(){
return openssl_get_privatekey(file_get_contents('E:\项目\cert\apiclient_key.pem'));//商户平台API安全证书中下载，保存到服务器 直接读取就可以
}
//签名
private function sign($url,$http_method,$timestamp,$nonce,$body,$mch_private_key,$merchant_id,$serial_no){
$url_parts=parse_url($url);
$canonical_url=($url_parts['path'].(!empty($url_parts['query'])?"?${url_parts['query']}":""));
$message=
$http_method . "\n".
$canonical_url . "\n".
$timestamp . "\n".
$nonce . "\n".
$body . "\n";
openssl_sign($message,$raw_sign,$mch_private_key,'sha256WithRSAEncryption');
$sign=base64_encode($raw_sign);
$schema='WECHATPAY2-SHA256-RSA2048';
$token=sprintf(
'mchid="%s",nonce_str="%s",signature="%s",timestamp="%d",serial_no="%s"',
$merchant_id,
$nonce,
$sign,
$timestamp,
$serial_no
);
return $token;
}
//curl提交
private function curl($url,$data=[],$header,$method='POST'){
$curl=curl_init();
curl_setopt($curl,CURLOPT_URL,$url);
curl_setopt($curl,CURLOPT_HTTPHEADER,$header);
curl_setopt($curl,CURLOPT_HEADER,false);
curl_setopt($curl,CURLOPT_RETURNTRANSFER,1);
curl_setopt($curl,CURLOPT_SSL_VERIFYPEER,false);
if($method=="POST"){
curl_setopt($curl,CURLOPT_POST,TRUE);
curl_setopt($curl,CURLOPT_POSTFIELDS,$data);
}
$result=curl_exec($curl);
curl_close($curl);
return $result;
}
//二次签名
public function signJS($wxid,$timeStamp,$nonce,$package,$mch_private_key){
$message=
$wxid . "\n".
$timeStamp . "\n".
$nonce . "\n".
$package . "\n";
openssl_sign($message,$raw_sign,$mch_private_key,'sha256');
$sign=base64_encode($raw_sign);
return $sign;
}
JS代码：直接写在网页即可，即可调用微信浏览器内部的js方法 调起支付
function onBridgeReady(){
//alert(<?php echo $time;?>);
WeixinJSBridge.invoke(
'getBrandWCPayRequest', {
"appId":"<?php echo $appid;?>", //商户appid
"timeStamp":"<?php echo $time;?>", //时间戳，自1970年以来的秒数
"nonceStr":"<?php echo $nonce;?>", //随机串
"package":"prepay_id=<?php echo $prepay_id;?>", //预订单标识，注意：要拼上 “prepay_id”
"signType":"RSA", //微信签名方式：
"paySign":"<?php echo $sign;?>" //微信签名
},
function(res){
if(res.err_msg == "get_brand_wcpay_request:ok" ){
window.location.href="支付成功后的跳转链接";
}else if(res.err_msg =="get_brand_wcpay_request:cancel"){
window.location.href="取消支付后的跳转链接";
}else{// get_brand_wcpay_request:fail 支付失败
alert('支付失败');
window.location.href="支付失败后的跳转链接";
}
});
}
if (typeof WeixinJSBridge == "undefined"){
if( document.addEventListener ){
document.addEventListener('WeixinJSBridgeReady', onBridgeReady, false);
}else if (document.attachEvent){
document.attachEvent('WeixinJSBridgeReady', onBridgeReady);
document.attachEvent('onWeixinJSBridgeReady', onBridgeReady);
}
}else{
onBridgeReady();
}
微信JSAPI合单发起支付到这里就完事啦，下篇说一下，支付回调
