Laravel教程: 3分钟实现小程序微信支付接入(上)——唤起支付

微信支付的接入，如果不使用成熟的开发包，将是巨大的工作量。

依赖 EasyWechat

先在 laravel 项目中依赖 easywechat 这个包

composer require "overtrue/laravel-wechat":"^4.0"

配置
在 .env 中添加微信支付的 key 配置

WECHAT_PAYMENT_SANDBOX=false
WECHAT_PAYMENT_APPID=wx64c***
WECHAT_PAYMENT_MCH_ID=150***
WECHAT_PAYMENT_KEY=ZZDDD***
WECHAT_PAYMENT_CERT_PATH=/home/secret/apiclient_cert.pem
WECHAT_PAYMENT_KEY_PATH=/home/secret/apiclient_key.pem
WECHAT_PAYMENT_NOTIFY_URL=https://www.mysite.com/gateway/wxpay/callback

如果你需要额外的配置，可以运行 php artisan vendor:publish --provider="Overtrue\LaravelWeChat\ServiceProvider" ，然后在 config/wechat.php 中可以看到 easywecaht 可以支持的全部配置。

编写接口逻辑

新建一个 App/Repositories/PayRepository.php

<?php
namespace App\Repositories;

use App\User;
use function EasyWeChat\Kernel\Support\generate_sign;

class PayRepository
{
    /**
     * 发起微信支付
     *
     * @return Array
     */
    public function pay(User $user)
    {
        $this->wxpay = app('easywechat.payment');

        $unify = $this->wxpay->order->unify([
            'body' => $this->transfer->name . ' ' . $this->tickets->count() . '张票',
            'out_trade_no' => '订单号',
            'total_fee' => bcmul('价格：单位元', 100),
            'trade_type' => 'JSAPI',
            'openid' => $user->openid, // 用户的openid
        ]);

        if ($unify['return_code'] === 'SUCCESS' && !isset($unify['err_code'])) {
            $pay = [
                'appId' => config('wechat.payment.default.app_id'),
                'timeStamp' => (string) time(),
                'nonceStr' => $unify['nonce_str'],
                'package' => 'prepay_id=' . $unify['prepay_id'],
                'signType' => 'MD5',
            ];

            $pay['paySign'] = generate_sign($pay, config('wechat.payment.default.key'));

            return $pay;
        } else {
            $unify['return_code'] = 'FAIL';
            return $unify;
        }
    }
}

新建一个 App/Http/Controllers/PayController.php

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Repositories\PayRepository;
use Illuminate\Support\Facades\Response;

class PayController extends Controller
{
    /**
     * PayRepository
     *
     * @var PayRepository
     */
    protected $pay_repository;

    public function __construct(PayRepository $pay_repository)
    {
        $this->pay_repository = $pay_repository;
    }

    /**
     * 微信支付
     *
     * @return Response
     */
    public function pay()
    {
        $user = auth()->user();

        $pay = $this->pay_repository->pay($user);
        return Response::success(['pay' => $pay]);
    }
}

绑定路由 routes/api.php

<?php
Route::post('/buy/pay', 'PayController@pay')->name('pay');

编写JS逻辑

在页面 JS 里面编辑支付逻辑

    onPay: function (e) {
        wx.request({
            url: '/api/buy/pay',
            method: 'POST',
            success: (res) => {
                if (res.data.pay.result_code != 'SUCCESS') {
                    return wx.showModal({
                        content: res.data.pay.return_msg + res.data.pay.err_code_des,
                        showCancel: false
                    });
                }
                res.data.pay.success = (res) => {
                    wx.showModal({
                        content: '您已成功支付',
                        showCancel: false
                    });
                };

                res.data.pay.fail = (res) => {
                    if (res.errMsg == 'requestPayment:fail cancel') {
                        return wx.showToast({
                            icon: 'none',
                            title: '用户取消支付',
                        });
                    }
                };

                wx.requestPayment(res.data.pay);
            }
        });
    },

在页面按钮上调用