Detailed explanation of how to connect PHP to PayPal payment

                                                       

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##Environment preparation

Register paypal account
• Register paypal developer account
• Create paypal sandbox test account
• Create paypal application
• Download PHP SDK
• Realize payment
• Realize payment success callback
• Realize refund
• More API code templates

Register paypal account

www.paypal.com Register merchant account
• Select, "Create merchant user", fill in the information as required, and go to your email to activate after registration

Register a paypal developer account

developer.paypal.com Use the account registered in the previous step to log in
• 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.
• 
  
Use the test account you just created to log in to the sandbox test site and view the amount and transaction information www.sandbox.paypal.com

##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

The following is the code snippet to generate payment, the pseudo code

• 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
        }
    }

  

The following is Callback code snippet for successful payment, pseudo code

• 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());
        }
    }

Refund

Refund You must have a slip number for successful payment
One slip number can be used for multiple refunds
After the refund is successful, the account number It is not reflected in the transaction record. During the test, please log in to the test account and record the changes in the balance yourself to determine whether the refund is successful.
The merchant account will reduce the balance and increase the handling fee (processing fee) (The fee was overcharged for previous payments), the user account will increase the balance

• 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
        }
    }

  More interface code examples

http://paypal.github.io/PayPal-PHP-SDK/sample/

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