fb-file-url.php

function sv_facebook_feed_url_admin_notice(){

	if ( class_exists( 'WC_Facebook_Product_Feed' ) ) {

		$feed_file_url = class_exists( 'SkyVerge\WooCommerce\Facebook\Products\Feed' ) ? get_bloginfo( 'url' ) . '/?wc-api=wc_facebook_get_feed_data&secret=' . SkyVerge\WooCommerce\Facebook\Products\Feed::get_feed_secret() : '';

		if ( ( isset( $_GET['page'], $_GET['tab'], $_GET['section'] ) && 
			( 'wc-settings' == $_GET['page'] && 'integration' == $_GET['tab'] && 
			'facebookcommerce' == $_GET['section'] ) ) || 
			( isset( $_GET['page'] ) && 'wc-facebook' == $_GET['page'] ) ) {

			echo '<div class="notice notice-warning">';

				echo '<p>Feed URL: <a href="' . $feed_file_url . '">' . $feed_file_url . '</a></p>';

			echo '</div>';
		}
	}
}
add_action( 'admin_notices', 'sv_facebook_feed_url_admin_notice' );