微信支付文档
前期准备流程
- 微信公众号申请
- 支付商户号申请
- 微信公众号绑定支付商户号
4.设置白名单、生成AppSecret（开发-基本配置） 
5.申请Api证书、设置APIv3密钥 
6.设置支付配置、jsapi支付授权目录、Native支付回调链接（产品中心-开发配置） 
支付流程
1.前端调用后端下单接口1
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47/**
* 创建订单
* @param {*} active
* @param {*} mobile
* @param {*} token
*/
function createOrder(active, mobile, token) {
$.showLoading();
$.ajax({
type: 'post',
url: url,
data: { 'active': active, 'pay_type': 'wechat', 'mobile': mobile },
dataType: 'json',
beforeSend: function (XMLHttpRequest) {
XMLHttpRequest.setRequestHeader("token", token);
},
success: function (res) {
try {
if (res.status == 'error' || res.code != 200) {
$.toptip(res.message, 'warning')
return false;
}
WeixinJSBridge.invoke('getBrandWCPayRequest', {
"appId": res.data.appId,
"timeStamp": res.data.timeStamp,
"nonceStr": res.data.nonceStr,
"package": res.data.package,
"signType": res.data.signType,
"paySign": res.data.paySign
},
function (res) {
if (res.err_msg == "get_brand_wcpay_request:ok") {
$.toptip('支付成功', 'success')
}
});
} catch (err) {
toLogin();
}
},
error: function (res) {
$.toptip('网络错误', 'warning')
}, complete: function (res) {
$.hideLoading();
}
})
}
<a href="javascript:;" class="weui-btn weui-btn_primary" onclick="createOrder(1,mobile,token)">立即支付</a>
2.处理信息、生成订单、返回支付信息1
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163/**
* 生成订单
* @param $userId
* @param $mobile
* @param int $active
* @param string $payType
* @return array|mixed
* @throws ApiException
* @throws \Throwable
*/
public function createOrder($userId, $mobile, $active = 1, $payType = 'wechat')
{
DB::beginTransaction();
try {
if ($this->countWaitOrderByUserId($userId)) {
throw new ApiException('您有未支付的订单，请先处理完毕', 500);
}
$activity = $this->findActive($active);
if (!$activity) {
throw new ApiException('充值金额有误', 500);
}
$orderId = StringHelper::getOrderId('R');
$orderData = [
'order_id' => $orderId,
'user_id' => $userId,
'original_price' => $activity->original_price,
'price' => $activity->price,
'pay_type' => $payType,
'mobile' => $mobile,
'active' => $active
];
if (!$this->insertOrder($orderData)) {
throw new ApiException('订单创建失败', 500);
}
// 请求微信统一下单
if ($result = $this->payOrder($orderId, $userId)) {
DB::commit();
return $result;
}
throw new ApiException('统一下单失败', 500);
} catch (\Exception $exception) {
DB::rollBack();
throw new ApiException($exception->getMessage(), 500);
}
}
/**
* 微信统一下单
* @param $orderId
* @param $userId
* @return mixed
* @throws ApiException
* @throws GuzzleException
*/
public function payOrder($orderId, $userId)
{
$orderInfo = $this->findOrderByOrderId($orderId);
if (!$orderInfo || $orderInfo->user_id != $userId) {
throw new ApiException('订单不存在', 500);
}
$userInfo = (new UserService())->findUserById($userId, ['openid']);
if (!$userInfo) {
throw new ApiException('用户不存在', 500);
}
if (!$userInfo->openid) {
throw new ApiException('请先绑定微信', 500);
}
$payParam = config('wechat.config');
//统一下单参数
$payConfig = [
'appid' => $payParam['appId'],
'mchid' => $payParam['mchId'],
'description' => $orderInfo['price'] . '话费充值-话费慢充72小时内到账',
'out_trade_no' => $orderId,
'notify_url' => $payParam['notifyUrl'],
'amount' => [
'total' => $orderInfo['price'],
'currency' => 'CNY'
],
'payer' => [
'openid' => $userInfo['openid']
]
];
// 重点，微信apiv3必须在headers里设置四个参数
$client = new Client();
$httpClient = $client->post($payParam['payUrl'], [
'headers' => [
'Content-Type' => 'application/json',
'User-Agent' => 'Mozilla/4.0',
'Accept' => 'application/json',
'Authorization' => StringHelper::getAuth($payParam['payUrl'], json_encode($payConfig), 'POST')
],
'json' => $payConfig
]);
$result = $httpClient->getBody()
->getContents();
$payResult = json_decode($result, true);
if ($httpClient->getStatusCode() != 200) {
throw new ApiException('支付错误', 500);
}
if (isset($payResult['errcode'])) {
throw new ApiException($payResult['errmsg'], 500);
}
if (isset($payResult['code'])) {
throw new ApiException($payResult['code'], 500);
}
// 获取支付参数
$appId = $payParam['appId'];
$time = time();
$str = StringHelper::createNonce();
$prepayId = 'prepay_id=' . $payResult['prepay_id'];
$message = $appId . "\n" .
$time . "\n" .
$str . "\n" .
$prepayId . "\n";
return [
'appId' => $payParam['appId'],
'timeStamp' => $time,
'nonceStr' => $str,
'package' => 'prepay_id=' . $payResult['prepay_id'],
'signType' => 'RSA',
'paySign' => StringHelper::getSign($message)
];
}
// 生成字符串
public static function createNonce($length = 32)
{
$chars = "abcdefghijklmnopqrstuvwxyz0123456789";
$str = "";
for ($i = 0; $i < $length; $i++) {
$str .= substr($chars, mt_rand(0, strlen($chars) - 1), 1);
}
return $str;
}
// 生成auth
public static function getAuth($url, $body, $type = 'POST')
{
$config = Config::get('wechat.config');
$nonce = self::createNonce();
$timestamp = time();
$url_parts = parse_url($url);
$canonical_url = ($url_parts['path'] . (!empty($url_parts['query']) ? "?${url_parts['query']}" : ""));
$message = $type . "\n" .
$canonical_url . "\n" .
$timestamp . "\n" .
$nonce . "\n" .
$body . "\n";
$sign = self::getSign($message);
$schema = 'WECHATPAY2-SHA256-RSA2048';
$token = sprintf('mchid="%s",nonce_str="%s",timestamp="%d",serial_no="%s",signature="%s"',
$config['mchId'], $nonce, $timestamp, $config['serialNo'], $sign);
return $schema . ' ' . $token;
}
// 获取证书
public static function getSign($message)
{
$filePath = '../resources/cert/apiclient_key.pem';
openssl_sign($message, $raw_sign, openssl_get_privatekey(file_get_contents($filePath)), 'sha256WithRSAEncryption');
return base64_encode($raw_sign);
}
完成支付
这篇文章没有使用微信的sdk，所以代码量还有有点大的，不过整体逻辑简单。
