MC-36554: Customer should be able to re-use the payflowPro_cc_vault as payment method for subsequent orders

- added integration test to cover pay with vault use case

Author: dthampy

app/code/Magento/PaypalGraphQl/Model/PayflowProCcVaultAdditionalDataProvider.php

@@ -0,0 +1,41 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+declare(strict_types=1);
+
+namespace Magento\PaypalGraphQl\Model;
+
+use Magento\Framework\GraphQl\Exception\GraphQlInputException;
+use Magento\QuoteGraphQl\Model\Cart\Payment\AdditionalDataProviderInterface;
+
+/**
+ * Get payment additional data for Payflow pro payment
+ */
+class PayflowProCcVaultAdditionalDataProvider implements AdditionalDataProviderInterface
+{
+    private const PATH_ADDITIONAL_DATA = 'payflowpro_cc_vault';
+    /**
+     * Format Payflow input into value expected when setting payment method
+     *
+     * @param array $args
+     * @return array
+     */
+    public function getData(array $args): array
+    {
+        if (!isset($args[self::PATH_ADDITIONAL_DATA])) {
+            throw new GraphQlInputException(
+                __('Required parameter "payflowpro_cc_vault" for "payment_method" is missing.')
+            );
+        }
+
+        if (!isset($args[self::PATH_ADDITIONAL_DATA]['public_hash'])) {
+            throw new GraphQlInputException(
+                __('Required parameter "public_hash" for "payflowpro_cc_vault" is missing.')
+            );
+        }
+
+        return $args[self::PATH_ADDITIONAL_DATA];
+    }
+}