What are potential reasons for receiving a fatal error with a HTTP 400 response code when creating a PayPal agreement in PHP?

When receiving a fatal error with a HTTP 400 response code when creating a PayPal agreement in PHP, it could be due to incorrect parameters being sent in the request. Double-check the parameters being passed and ensure they are in the correct format and match the PayPal API documentation. Additionally, make sure that the necessary headers are included in the request. 

// Sample PHP code snippet to create a PayPal agreement with correct parameters

$apiContext = new \PayPal\Rest\ApiContext(
    new \PayPal\Auth\OAuthTokenCredential(
        'CLIENT_ID',
        'CLIENT_SECRET'
    )
);

$agreement = new \PayPal\Api\Agreement();
$agreement->setName('Subscription Agreement')
    ->setDescription('Subscription to premium service')
    ->setStartDate('2022-01-01T00:00:00Z');

// Set plan id
$plan = new \PayPal\Api\Plan();
$plan->setId('P-1234567890');
$agreement->setPlan($plan);

// Set payer
$payer = new \PayPal\Api\Payer();
$payer->setPaymentMethod('paypal');
$agreement->setPayer($payer);

try {
    $createdAgreement = $agreement->create($apiContext);
    echo "Agreement created successfully. Agreement ID: " . $createdAgreement->getId();
} catch (\PayPal\Exception\PayPalConnectionException $ex) {
    echo "Error creating agreement: " . $ex->getData();
}

Keywords

PayPal API HTTP 400 Fatal error PHP Agreement creation

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