How fix paypal error with response code 400

Hello,
Implementing paypal in my laravel 5.8 app
I got error :

Got Http response code 400 when accessing https://api.sandbox.paypal.com/v1/payments/payment/PAYID-NNNNNNNNNN/execute.

Code (markup):

My control :

    public function paypal_payment_execute()
    {
        // After Step 1
        $apiContext = new \PayPal\Rest\ApiContext(
            new \PayPal\Auth\OAuthTokenCredential(
                'NNNNN',     // ClientID
                'NNNNN'      // ClientSecret
            )...

PHP:

How fix paypal error with response code 400

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