我正在尝试使用 this 通过 paypal 进行捐赠网址。当我登录 PayPal 并付款时，我收到以下消息

我确实有后端代码，这就是它的样子。

<?php
use PayPal\Rest\ApiContext;
use PayPal\Auth\OAuthTokenCredential;
use PayPal\Api\Payer;
use PayPal\Api\Details;
use PayPal\Api\Amount;
use PayPal\Api\Transaction;
use PayPal\Api\Payment;
use PayPal\Api\RedirectUrls;
use PayPal\Api\PaymentExecution;

require __DIR__ . DIRECTORY_SEPARATOR . '../vendor/autoload.php';

/**
* Edri PayPal Pyment
*/
class Edri_PayPal_Payment
{
    
    private $api;

    private $payer;

    private $details;

    private $amount;

    private $transaction;

    private $payment;

    private $redirectUrls;


    function __construct()
    {
        $this->api = $this->setup_PayPal_Api();
    }

    private function debug($val)
    {
        echo '<pre>';
        var_dump($val);
        echo '</pre>';
    }

    private function setup_PayPal_Api()
    {
        $api = new ApiContext(
            new OAuthTokenCredential(
                'MyPayPalClientID',
                'MyClientSecret'
            )
        );

        $api->setConfig(array(
            'mode' => 'live',
            'http.ConnectionTimeOut' => 30,
            'Log.LogEnabled' => false,
            'Log.FileName' => '',
            'Log.LogLevel' => 'FINE',
            'validation.level' => 'log'
        ));

        return $api;
    }

    private function setupPayer()
    {
        $this->payer = new Payer();

        $this->payer->setPayment_method('paypal');
    }

    private function setupDetails($amount)
    {
        $this->details = new Details();
        $this->details->setShipping('0.00')
            ->setTax('0.00')
            ->setsubTotal($amount);
    }

    private function setupAmount($amount)
    {

        $this->amount = new Amount();

        $this->amount->setCurrency('EUR')
            ->setTotal($amount)
            ->setDetails($this->details);
    }
    
    private function setupTransaction($amount)
    {

        $this->transaction = new Transaction();

        $this->transaction->setAmount($this->amount)
            ->setDescription('Make a donation of €' . $amount .  ' to EDRi');
    }
    
    private function setupPayment()
    {
        $this->payment = new Payment();

        $this->payment->setIntent('sale')
            ->setPayer($this->payer)
            ->setTransactions(array($this->transaction))
            ->setRedirectUrls($this->redirectUrls);
    }

    private function setupRedirectUrls()
    {
        $this->redirectUrls = new RedirectUrls();

        $this->redirectUrls->setReturnUrl('https://edri.org/payment?pppa=true')
            ->setCancelUrl('https://edri.org/payment?pppa=false');
    }

    public function prepare_payment ($paymentCredtials) {
        $amount = str_replace(',', '', number_format($paymentCredtials['edriPayment_amount'], 2));

        $this->setupPayer();
        $this->setupDetails($amount);
        $this->setupAmount($amount);
        $this->setupTransaction($amount);
        $this->setupRedirectUrls();
        $this->setupPayment();  

        try {

            $this->payment->create($this->api);

            $paymentID = $this->payment->getId();
        
        } catch (Exception $e) {
            $this->log($e);
            
            header('Location: https://edri.org/donation-oops');

            return false;
        }

        return $paymentID;

    }

    private function log($log){

        $file = __DIR__ . DIRECTORY_SEPARATOR . '../logs/paypal_log.txt';


        // Open the file to get existing content
        $current = file_get_contents($file);
        // Append a new person to the file
        $current .=  $prefix . ' ' . date('m/d/Y h:i:s a', time()) . ' //// ' . "\n";
        $current .=  self::var_dump_str($log) . "\n";
        // Write the contents back to the file
        file_put_contents($file, $current);
    }

    public function execute_payment($paymentCredentials)
    {
        $this->debug($paymentCredentials);

        $payment = Payment::get($paymentCredentials['paymentId'], $this->api);

        $execution = new PaymentExecution();

        $execution->setPayerId($paymentCredentials['PayerID']);


        try {

            echo $payment->execute($execution, $this->api);
        
        } catch (Exception $e) {
            $this->log($e);
            
            header('Location: https://edri.org/donation-oops');

            return false;
        }

        return $payment->state = 'approved' ? true : false;
        
    }

    public function kickoff_payment()
    {

        foreach ($this->payment->getLinks() as $link) {
            if ($link->getRel() == 'approval_url') {
                $redirectUrl = $link->getHref();
            }
        }

        header('Location: ' . $redirectUrl);
    }

}

我检查了日志，没有任何报告。 API 调用似乎也不错。

任何使这项工作可行的建议都会有所帮助。

最佳答案

您的 var_dump() 语句有可能违反了“标题前无内容输出”规则，因此，用户的支付流程会因您的代码而停止，在 header('Location: ' . $redirectUrl); 之前可以重定向到 PayPal 以完成工作。

尝试删除那些 var_dump，并改为执行 error_log(printf($val, true))，以免中断对 header() 的调用。

编辑 - 来自 http://php.net/manual/en/function.header.php :

Remember that header() must be called before any actual output is sent, either by normal HTML tags, blank lines in a file, or from PHP. It is a very common error to read code with include, or require, functions, or another file access function, and have spaces or empty lines that are output before header() is called. The same problem exists when using a single PHP/HTML file.

<html>
<?php
/* This will give an error. Note the output
 * above, which is before the header() call */
header('Location: http://www.example.com/');
exit;
?>

关于php - Paypal 未继续接收付款，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/39703939/