本文僅記錄了微信小程序支付開發的基本流程和代碼，具體業務需自行修改。tp5框架下演示：
參考：
微信小程序支付：業務流程
SDK與DEMO: 下載頁
PHPPayDemo: demo
小程序端：
goPay(e){
var that = this;
//發起預支付，獲取所需參數 wx.request({ url: app.globalData.host + '/api/wx_pay/createOrder', //請求地址 data: { openid: wx.getStorageSync('openid'), total_fee: that.data.totalPrice, goods: JSON.stringify(that.data.goods) }, method: 'POST', success(res){
console.log(res)
if(res.data.code == 1){ //發起微信支付 wx.requestPayment({ timeStamp: res.data.data.timeStamp, nonceStr: res.data.data.nonceStr, package: res.data.data.package, signType: res.data.data.signType, paySign: res.data.data.paySign, success(r) {
console.log(r) //do something //比如回調，修改狀態等操作 }, fail() { wx.showToast({ title: '支付失敗', icon: 'none' }) } }) }else{ wx.showToast({ title: res.data.data, icon: 'none' }) } } }) },
PHP端：
WxPay.php
<?php namespace app\api\controller; use app\api\controller\Common; use think\Db; /** * 微信支付 */ class WxPay extends Common { //生成訂單 public function createOrder(){ if (request()->isPost()) {
$openid = input('openid'); $total_fee = input('total_fee');$orderid = get_order_sn(); //生成訂單號 if (!$openid) { return json(array('code'=>3, 'data'=>'no openid')); } $goods = json_decode(input('goods'), TRUE); // 添加訂單,自行添加 $insert_order_id = Db::name('order') ->insertGetId(array( 'pay_price' => $total_fee, 'orderid' => $orderid )); if($insert_order_id){
/* 調用微信【統一下單】 */
$res = $this->pay($total_fee, $openid, $orderid);
return json(array('code'=>1, 'data'=>$res, 'oid'=>$insert_order_id));
}
}
}
/* 首先在服務器端調用微信【統一下單】接口，返回prepay_id和sign簽名等信息給前端，前端調用微信支付接口 */
private function Pay($total_fee, $openid, $order_id, $body=''){
$appid = config('myapp.appid');//小程序的appid
$body = config('site.title').'-'.$body;
$mch_id = config('myapp.pay_mchid');
$KEY = config('myapp.pay_apikey');
$nonce_str = (string)mt_rand(10000, 99999).time();//隨機字符串
$notify_url = request()->domain().'api/wx_pay/notify'; //支付完成回調地址url,不能帶參數
$out_trade_no = $order_id; //商戶訂單號
$spbill_create_ip = $_SERVER['SERVER_ADDR'];
$trade_type = 'JSAPI';//交易類型 默認JSAPI
//這里是按照順序的 因為下面的簽名是按照(字典序)順序 排序錯誤 肯定出錯
$post['appid'] = $appid;
$post['body'] = $body;
$post['mch_id'] = $mch_id;
$post['nonce_str'] = $nonce_str;//隨機字符串
$post['notify_url'] = $notify_url;
$post['openid'] = $openid;
$post['out_trade_no'] = $out_trade_no;
$post['spbill_create_ip'] = $spbill_create_ip;//服務器終端的ip
$post['total_fee'] = intval($total_fee); //總金額 最低為一分錢 必須是整數
$post['trade_type'] = $trade_type;
$sign = $this->MakeSign($post, $KEY); //簽名
$post_xml = '<xml> <appid>'.$appid.'</appid>
<body>'.$body.'</body>
<mch_id>'.$mch_id.'</mch_id>
<nonce_str>'.$nonce_str.'</nonce_str>
<notify_url>'.$notify_url.'</notify_url>
<openid>'.$openid.'</openid>
<out_trade_no>'.$out_trade_no.'</out_trade_no>
<spbill_create_ip>'.$spbill_create_ip.'</spbill_create_ip>
<total_fee>'.$total_fee.'</total_fee>
<trade_type>'.$trade_type.'</trade_type>
<sign>'.$sign.'</sign></xml> ';
//統一下單接口prepay_id
$url = 'https://api.mch.weixin.qq.com/pay/unifiedorder';
$xml = $this->http_request($url,$post_xml); //POST方式請求http
$array = $this->xml2array($xml); //將【統一下單】api返回xml數據轉換成數組，全要大寫
if($array['RETURN_CODE'] == 'SUCCESS' && $array['RESULT_CODE'] == 'SUCCESS'){
$time = time();
$tmp=''; //臨時數組用於簽名
$tmp['appId'] = $appid;
$tmp['nonceStr'] = $nonce_str;
$tmp['package'] = 'prepay_id='.$array['PREPAY_ID'];
$tmp['signType'] = 'MD5';
$tmp['timeStamp'] = "$time";
$data['code'] = 1;
$data['timeStamp'] = "$time"; //時間戳
$data['nonceStr'] = $nonce_str; //隨機字符串
$data['signType'] = 'MD5'; //簽名算法，暫支持 MD5
$data['package'] = 'prepay_id='.$array['PREPAY_ID']; //統一下單接口返回的 prepay_id 參數值，提交格式如：prepay_id=*
$data['paySign'] = $this->MakeSign($tmp,$KEY); //簽名,具體簽名方案參見微信公眾號支付幫助文檔;
$data['out_trade_no'] = $out_trade_no;
}else{
$data['code'] = 0;
$data['msg'] = "錯誤";
$data['RETURN_CODE'] = $array['RETURN_CODE'];
$data['RETURN_MSG'] = $array['RETURN_MSG'];
$data['ERR_CODE_DES'] = $array['ERR_CODE_DES'];
}
return $data;
}
/** * 生成簽名, $KEY就是支付key * @return 簽名 */
public function MakeSign($params,$KEY){
//簽名步驟一：按字典序排序數組參數
ksort($params);
$string = $this->ToUrlParams($params); //參數進行拼接key=value&k=v
//簽名步驟二：在string后加入KEY
$string = $string . "&key=".$KEY;
//簽名步驟三：MD5加密
$string = md5($string);
//簽名步驟四：所有字符轉為大寫
$result = strtoupper($string);
return $result;
}
/** * 將參數拼接為url: key=value&key=value * @param $params * @return string */
public function ToUrlParams( $params ){
$string = '';
if( !empty($params) ){
$array = array();
foreach( $params as $key => $value ){
$array[] = $key.'='.$value;
}
$string = implode("&",$array);
}
return $string;
}
/** * 調用接口， $data是數組參數 * @return 簽名 */
public function http_request($url, $data = null, $headers=array()) {
$curl = curl_init();
if( count($headers) >= 1 ){
curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);
}
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, FALSE);
if (!empty($data)){
curl_setopt($curl, CURLOPT_POST, 1);
curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
}
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
$output = curl_exec($curl);
curl_close($curl);
return $output;
}
//獲取xml里面數據，轉換成array
private function xml2array($xml){
$p = xml_parser_create();
xml_parse_into_struct($p, $xml, $vals, $index);
xml_parser_free($p);
$data = "";
foreach ($index as $key=>$value) {
if($key == 'xml' || $key == 'XML')
continue;
$tag = $vals[$value[0]]['tag'];
$value = $vals[$value[0]]['value'];
$data[$tag] = $value;
}
return $data;
}
//支付完后的回調
public function notify(){
//do something
//更新支付狀態
//更新購物商品狀態
return json(array('code'=> 1, 'data'=>'支付成功'));
}
沒整理好，以后有時間再說吧，，，
以上所有方法都可從SDK及DEMO中尋得，官方參考。