vendor/omnipay/paypal/src/Message/ProPurchaseRequest.php

<?php
 
namespace Omnipay\PayPal\Message;
 
class ProPurchaseRequest extends ProAuthorizeRequest
{
    public function getData()
    {
        $data = parent::getData();
        $data['PAYMENTACTION'] = 'Sale';
 
        return $data;
    }
}