Detailed explanation of how to connect PHP to PayPal payment-PHP Tutorial-php.cn

##Environment preparation

Register paypal developer account
Create paypal sandbox test account
Create paypal application
Download PHP SDK
Realize payment
Realize payment success callback
Realize refund
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Select, "Create merchant user", fill in the information as required, and go to your email to activate after registration

Click Accounts in the left navigation bar and create two sandbox accounts, one personal account (personal) for payment and one merchant account (business) for collection. The system has created two by default. You can choose to create them yourself. Easy to remember; after creating an account, remember to add a balance to the current account for subsequent testing.

##Create Sandbox Application APP

A Default Application is created by default for the account. Click to view to obtain the ClientId and Secret; save them and use them in subsequent interface calls; ( Please re-create a Live application when going online)

Download SDK

I use it laravel framework, use composer to download the paypal package

composer require paypal/rest-api-sdk-php

implementation Payment

function createPayPal(){
      $shippingPrice = 2;
      $taxPrice = 0;
      $subTotal = 26;
      $item1 = new PayPal\Api\Item();
      $item1->setName("产品2")->setCurrency("USD")->setQuantity(1)->setPrice(10);
      $item2 = new PayPal\Api\Item();
      $item2->setName("产品1")->setCurrency("USD")->setQuantity(2)->setPrice(8);

      $itemList = new PayPal\Api\ItemList();
      $itemList->addItems([$item1,$item2]);

      // Set payment details
      $details = new PayPal\Api\Details();
      $details->setShipping($shippingPrice)->setTax($taxPrice)->setSubtotal($subTotal);

      // Set payment amount
      //注意，此处的subtotal，必须是产品数*产品价格，所有值必须是正确的，否则会报错
      $total = $shippingPrice + $subTotal + $taxPrice;
      $amount = new PayPal\Api\Amount();
      $amount->setCurrency("USD")->setTotal($total)->setDetails($details);

      // Set transaction object
      $transaction = new PayPal\Api\Transaction();
      $transaction->setAmount($amount)->setItemList($itemList)->setDescription("这是交易描述")
          ->setInvoiceNumber(uniqid());//setInvoiceNumber为支付唯一标识符,在使用时建议改成订单号

      $payer = new PayPal\Api\Payer();
      $payer->setPaymentMethod('paypal');//["credit_card", "paypal"]
      $redirectUrls = new PayPal\Api\RedirectUrls();
      $redirectUrl = "http://test.com/redirect/success";//支付成功跳转的回调
      $cancelUrl = "http://test.com/redirect/cancel";//取消支付的回调
      $redirectUrls->setReturnUrl($redirectUrl)->setCancelUrl($cancelUrl);

      // Create the full payment object
      $payment = new PayPal\Api\Payment();
      $payment->setIntent("sale")->setPayer($payer)->setRedirectUrls($redirectUrls)->addTransaction($transaction);

      try {
          $clientId = "xxxxxx";//上面应用的clientId和secret
          $secret = "XXXXXX";
          $oAuth = new \PayPal\Auth\OAuthTokenCredential($clientId, $secret);
          $apiContext =  new \PayPal\Rest\ApiContext($oAuth);
          if(env('APP_DEBUG') === false ){
              $apiContext->setConfig(['mode' => 'live']);//设置线上环境,默认是sandbox
          }
          $payment->create($apiContext);
          $approvalUrl = $payment->getApprovalLink();
          dd($approvalUrl);//这个是请求支付的链接，在浏览器中请求此链接就会跳转到支付页面
      } catch (\Exception $e) {
          dd($e->getMessage());//错误提示
      }
  }

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Detailed explanation of how to connect PHP to PayPal payment

function payRedirect(Request $request)
  {
      $paymentID = $request->get('paymentId');
      $payerId = $request->get('PayerID');

      $clientId = "xxxxxx";//上面应用的clientId和secret
      $secret = "XXXXXX";
      $oAuth = new \PayPal\Auth\OAuthTokenCredential($clientId, $secret);
      $apiContext =  new \PayPal\Rest\ApiContext($oAuth);       
      if(env('APP_DEBUG') === false ){
          $apiContext->setConfig(['mode' => 'live']);//设置线上环境,默认是sandbox
      }
      $payment = \PayPal\Api\Payment::get($paymentID, $apiContext);

      $execute = new \PayPal\Api\PaymentExecution();
      $execute->setPayerId($payerId);

      try{
          $payment = $payment->execute($execute, $apiContext);//执行,从paypal获取支付结果
          $paymentState = $payment->getState();//Possible values: created, approved, failed.
          $invoiceNum = $payment->getTransactions()[0]->getInvoiceNumber();
          $payNum = $payment->getTransactions()[0]->getRelatedResources()[0]->getSale()->getId();//这是支付的流水单号，必须保存，在退款时会使用到
          $total = $payment->getTransactions()[0]->getRelatedResources()[0]->getSale()->getAmount()->getTotal();//支付总金额
          $transactionState = $payment->getTransactions()[0]->getRelatedResources()[0]->getSale()->getState();//Possible values: completed, partially_refunded, pending, refunded, denied.

          if($paymentState == 'approved' && $transactionState == 'completed'){
              //处理成功的逻辑，例如：判断支付金额与订单金额，更新订单状态等
              return "success";//返回成功标识
          }else{
              //paypal回调错误,paypal状态不正确
              return "error";//返回错误标识
          }
      }catch(\Exception $e){
          dd($e->getMessage());
      }
  }

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Refund

function refundOrder()
  {
      try{
          $refundRequest = new \PayPal\Api\RefundRequest();
          $amount = new \PayPal\Api\Amount();
          $amount->setCurrency("USD")->setTotal(10);//退总金额
          $refundRequest->setAmount($amount);
          $refundRequest->setDescription("退款测试");
          $sale = new \PayPal\Api\Sale();
          $sale->setId("XXXXXXXXX");//支付单号,支付成功时保存的支付流水单号
          $clientId = "xxxxxx";//上面应用的clientId和secret
          $secret = "XXXXXX";
          $oAuth = new \PayPal\Auth\OAuthTokenCredential($clientId, $secret);
          $apiContext =  new \PayPal\Rest\ApiContext($oAuth);
          if(env('APP_DEBUG') === false ){
              $apiContext->setConfig(['mode' => 'live']);//设置线上环境,默认是sandbox
          }
          $detailedRefund = $sale->refundSale($refundRequest, $apiContext);//调接口
          $refundState = $detailedRefund->getState();//Possible values: pending, completed, cancelled, failed.

          //var_dump($refundedSale);
          if($refundState == 'completed'){
              //退款成功,返回
          }else{
              dd('paypal 退款失败, 状态不正确');
          }
      }catch (\Exception $exception){
          dd($exception->getMessage());//发生异常
      }
  }

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