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Magento 2 Paypal Fee (charge) and life cycle

In magento 2 paypal is implemented with module Payal , in case if the customer choose payapl as method of payment M2 use Magento\Paypal\Model\Cart in place of \Magento\Payment\Model\Cart , it used for collect items and amount and validate the infos collected before sending to paypal ,

The model have more additional methods as (it extend from parent Magento\Paypal\Model\Cart) :
getAmounts()  : Get shipping, tax, subtotal and discount amounts all together
_validate( ) : Check the line items and totals according to PayPal business logic limitations
_importItemsFromSalesModel() : Import items from sales model with workarounds for PayPal

Yeah after collecting the amounts and validate  let's consider we choose Paypal express , the checkout redirect the function Paypal/Controller/Express/Start Action but inside this action it use the global Api class Model/Api/Nvp.php

Example of customize  Payapl Fee :
First you need explore the complete process of how to add fee to order totals in magento2 in this link : http://magento.stackexchange.com/questions/92774/how-to-add-fee-to-order-totals-in-magento2
Ok you want add charge in case of the customer use paypal as method payment , we need add custom item to request sent to paypal and change the total amount sent (the class responsive is Nvp.php),
ok you need create plugin , go to Ibnab/PF/etc/di.xml or Ibnab/PF/etc/frontend/di.xml and write this lines :

  1.  
  2. <?xml version="1.0"?>
  3. <!--
  4. /**
  5.  * Copyright © 2015 Magento. All rights reserved.
  6.  * See COPYING.txt for license details.
  7.  */
  8. -->
  9. <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
  10.     <type name="Magento\Sales\Model\Order">
  11.         <plugin name="update_payment_fee_order" type="Ibnab\PF\Plugin\UpdateFeeForOrder"/>
  12.     </type>
  13.     <type name="Magento\Paypal\Model\Cart">
  14.         <plugin name="update_paypal_fee_order" type="Ibnab\PF\\Plugin\UpdateFeeForOrder"/>
  15.     </type>
  16. </config>
  17.  
  18.  

Here we modified to method getAllItems() of parent class \Magento\Payment\Model\Cart and getAmounts() of Magento\Paypal\Model\Cart
And After that create cretae the class  Ibnab/PF/Plugin/UpdateFeeForOrder.php :

  1.  
  2. <?php
  3. namespace Ibnab\PF\Plugin;
  4. class UpdateFeeForOrder
  5. {
  6.     /**
  7.      * @var \Magento\Quote\Model\QuoteFactory
  8.      */
  9.     protected $quote;
  10.     protected $logger;
  11.     protected $_checkoutSession;
  12.     protected $_registry;
  13.     const AMOUNT_Payment = 'payment_fee';
  14.     const AMOUNT_SUBTOTAL = 'subtotal';
  15.     public function __construct(
  16.         \Magento\Quote\Model\Quote $quote,
  17.         \Psr\Log\LoggerInterface $logger,
  18.         \Magento\Checkout\Model\Session $checkoutSession,
  19.         \Magento\Framework\Registry $registry
  20.     ) {
  21.         $this->quote = $quote;
  22.         $this->logger = $logger;
  23.         $this->_checkoutSession = $checkoutSession;
  24.         $this->_registry = $registry;
  25.     }
  26.     /**
  27.      * Get shipping, tax, subtotal and discount amounts all together
  28.      *
  29.      * @return array
  30.      */
  31.     public function afterGetAmounts($cart,$result)
  32.     {
  33.         $total = $result;
  34.         $quote = $this->_checkoutSession->getQuote();
  35.         $paymentMethod = $quote->getPayment()->getMethod();
  36.         $paypalMehodList = ['payflowpro','payflow_link','payflow_advanced','braintree_paypal','paypal_express_bml','payflow_express_bml','payflow_express','paypal_express'];
  37.         
  38.         if(in_array($paymentMethod,$paypalMehodList)){
  39.         $total[self::AMOUNT_SUBTOTAL] = $total[self::AMOUNT_SUBTOTAL] + $quote->getFeeAmount();
  40.         
  41.         }
  42.         
  43.         return  $total;
  44.     }
  45.     /**
  46.      * Get shipping, tax, subtotal and discount amounts all together
  47.      *
  48.      * @return array
  49.      */
  50.     public function beforeGetAllItems($cart)
  51.     {
  52.         $paypalTest = $this->_registry->registry('is_paypal_items')? $this->_registry->registry('is_paypal_items') : 0;
  53.         $quote = $this->_checkoutSession->getQuote();
  54.         $paymentMethod = $quote->getPayment()->getMethod();
  55.         
  56.         $paypalMehodList = ['payflowpro','payflow_link','payflow_advanced','braintree_paypal','paypal_express_bml','payflow_express_bml','payflow_express','paypal_express'];
  57.         if($paypalTest < 3 && in_array($paymentMethod,$paypalMehodList)){
  58.         if(method_exists($cart , 'addCustomItem' ))
  59.         {
  60.         $cart->addCustomItem(__("Payment Fee"), 1 ,$quote->getFeeAmount());
  61.         $reg = $this->_registry->registry('is_paypal_items');
  62.         $current = $reg + 1 ;
  63.         $this->_registry->unregister('is_paypal_items');
  64.         $this->_registry->register('is_paypal_items', $current);
  65.         }
  66.         }
  67.     }
  68. }
  69.  
  70.  

Here we  use the concept of after method in plugin it pass ed 2 Arguments the object of class and the result final , in  afterGetAmounts  we test if current payment method is paypal we add the charge ,
and in second method we used the concept of before and passed the object of class :
we have here 2 test for the current method and the number of access to method for ignoring the duplicate item .

You can get the complet Magento 2 Payment Fee support Paypal

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