woocommerce-paypal-payments/modules/ppcp-compat/services.php

<?php
/**
 * The compatibility module services.
 *
 * @package WooCommerce\PayPalCommerce\Compat
 */

declare(strict_types=1);

namespace WooCommerce\PayPalCommerce\Compat;

return array(

	'compat.ppec.mock-gateway' => static function( $container ) {
		$settings = $container->get( 'wcgateway.settings' );
		$title    = $settings->has( 'title' ) ? $settings->get( 'title' ) : __( 'PayPal', 'woocommerce-paypal-payments' );
		$title    = sprintf(
			/* Translators: placeholder is the gateway name. */
			__( '%s (Legacy)', 'woocommerce-paypal-payments' ),
			$title
		);

		return new PPEC\MockGateway( $title );
	},

);