An article explaining in detail how to access WeChat payment points with PHP (code example)

1. Introduction and activation of WeChat payment

1. Product introduction: https://pay.weixin.qq.com/wiki/doc/apiv3/open/pay /chapter3_1_0.shtml
2. Preparation before access: https://pay.weixin.qq.com/wiki/doc/apiv3/open/pay/chapter3_1_1.shtml
3. Test number configuration: https://pay.weixin.qq.com/wiki/doc/apiv3/open/pay/chapter3_1_5.shtml

2. Confirmation-free model development

Reference URL: https://pay.weixin.qq.com/wiki/doc/apiv3/open/pay/chapter3_1_3.shtml

• Step 1 The user places an order to purchase the product on the merchant side or service, at this time, we need to query the user's authorization status first
• Step 2 Guide the user to open the authorization service
• Step 3 Create a payment sub-order
• Step 4 The merchant is The user provides the service, and after the service is completed, the merchant calls the order completion interface to complete the current order.
• Step 5: Receive notification of successful deduction from the user, and the business process ends

3. SDK related

1. Official documents: https://pay.weixin.qq.com/wiki/doc/apiv3/wechatpay/wechatpay6_0.shtml
2. wechatpay-php (recommended): https://github.com/wechatpay-apiv3/wechatpay- php

4. Code example

/** * Notes: 步骤1 用户在商户侧下单购买产品或服务，此时，我们需要先对用户的授权状态进行查询 * User: XXX * DateTime: 2021/7/27 9:59 */ public function getAuthStatus(string $cid) { $openid = $this->getOpenid($cid); if (!$openid) { return false; } try { $resp = $this->instance->v3->payscore->permissions->openid->{'{openid}'} ->get( [ 'query' => [ 'appid' => $this->appid, 'service_id' => $this->serviceId, ], // uri_template 字面量参数 'openid' => $openid, ] ); $res = json_decode($resp->getBody()->getContents(), true); if ($res['authorization_state'] == 'AVAILABLE') { return true; } else { return false; } } catch (\Exception $e) { return false; /*echo($e->getResponse()->getStatusCode()); // 进行错误处理 echo $e->getMessage()->getReasonPhrase(), PHP_EOL; if ($e instanceof \Psr\Http\Message\ResponseInterface && $e->hasResponse()) { echo $e->getResponse()->getStatusCode() . ' ' . $e->getResponse()->getReasonPhrase(), PHP_EOL; echo $e->getResponse()->getBody(); }*/ } }

/** * Notes:步骤2 引导用户开启授权服务-获取预授权码 * User: XXX * DateTime: 2021/7/27 18:37 */ public function openAuthStatus() { try { $resp = $this->instance->v3->payscore->permissions->post( [ 'json' => [ 'service_id' => $this->serviceId, 'appid' => $this->appid, 'authorization_code' => $this->getRandStr(12), // 授权协议号,类似订单号 //'notify_url' => 'https://weixin.qq.com/', ] ] ); $res = json_decode($resp->getBody(), true); return $res['apply_permissions_token']; } catch (\Exception $e) { // 进行错误处理 /*if ($e->hasResponse()) { echo $e->getResponse()->getBody(); }*/ return false; } }

/** * Notes: 步骤3 创建支付分订单 * User: xxx * DateTime: 2021/7/27 19:21 * @param string $cid 用户ID * @param string $orderSn 订单号 */ public function makeOrder(string $cid, string $orderSn) { // 订单信息 .... $openid = $this->getOpenid($cid); if (!$openid) { return [ 'code' => -1, 'msg' => 'openid不可以为空', ]; } // 异步通知地址，有时候发现莫名的变成了localhost,这里先固定 $notiryUrl = route('api.v1.wxpayPointsNotify'); $json = [ 'out_order_no' => $orderSn, // 商户服务订单号 'appid' => $this->appid, // 应用ID 'service_id' => $this->serviceId, // 服务ID 'service_introduction' => '换电费用', // 服务信息，用于介绍本订单所提供的服务 ，当参数长度超过20个字符时，报错处理 'time_range' => [ 'start_time' => $startTime, //'20210729160710', ], 'risk_fund' => [ 'name' => 'ESTIMATE_ORDER_COST', // 风险金名称 'amount' => 300, // 风险金额 数字，必须>0（单位分） ], 'attach' => $orderSn,// 商户数据包 'notify_url' => $notiryUrl, 'openid' => $openid,// 用户标识 'need_user_confirm' => false,// 是否需要用户确认 ]; try { $resp = $this->instance->v3->payscore->serviceorder->post( [ 'json' => $json ] ); $res = json_decode($resp->getBody(), true); // 入库支付分订单 ... return [ 'code' => 0, 'msg' => '支付分订单创建完成', ]; } catch (\Exception $e) { // 进行错误处理 if ($e->hasResponse()) { $body = $e->getResponse()->getBody(); if ($body) { return [ 'code' => -1, 'msg' => (string)$body, ]; } } return ''; } }

Completing payment sub-orders, canceling payment sub-orders, and querying payment sub-orders are similar and will not be written out here.

/** * Notes: 异步通知 * User: XXX * DateTime: 2021/8/3 14:20 */ public function notify() { // 获取返回的信息 $responseBody = file_get_contents("php://input"); $responseArr = json_decode($responseBody, true); if ($responseArr) { $res = AesGcm::decrypt($responseArr['resource']['ciphertext'], 'xxxapi密钥', $responseArr['resource']['nonce'], $responseArr['resource']['associated_data']); $resArr = json_decode($res, true); if ($resArr) { // 记录日志 ... // 业务逻辑处理 ... // 订单日志记录 ... } else { return [ 'code' => -1, 'msg' => '解析有误', ]; } } else { return [ 'code' => -1, 'msg' => 'nothing post', ]; } }

5. Precautions

1. Strictly follow the parameter requirements in the document, and compare the differences between the incoming parameters and the official examples as soon as possible if there is a problem

2. Payment points orders must be canceled or completed

Recommended learning: "PHP Video Tutorial"

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