https://wpzoo.ch/en/2016/03/check-user-active-customer/

wpzoo_edd_is_active_customer.php

<?php
/*
 * Check if user has a valid subscription
 */
function wpzoo_edd_is_active_customer( $user_id = '' ) {
	// Fail gracefully if EDD Software Licencing not active
	if ( ! function_exists('edd_software_licensing') ) {
		return;
	}
	$license_keys = edd_software_licensing()->get_license_keys_of_user( $user_id );
	foreach ( $license_keys as $license ) {
		$status      = edd_software_licensing()->get_license_status( $license->ID );
		$post_status = get_post_status( $license->ID );
		if ( 'expired' !== $status && 'publish' === $post_status ) {
			return true;
		}
	}
	return false;
}