If checkout overridden by store checkout funnel

if_checkout_overriden_by_store_checkout.php

<?php 
function if_funnel_has_store_checkout_set() {
	if ( ! class_exists( 'WFFN_Common' ) || ! method_exists( 'WFFN_Common', 'get_store_checkout_id' ) || 0 === WFFN_Common::get_store_checkout_id() ) {
		return false;
	}


	$funnel = new WFFN_Funnel( WFFN_Common::get_store_checkout_id() );

	/**
	 * Check if this is a valid funnel and has native checkout
	 */
	if ( ! wffn_is_valid_funnel( $funnel ) ) {
		return false;
	}

	/**
	 * if native checkout set in store chekout funnel
	 */
	if ( true === $funnel->is_funnel_has_native_checkout() ) {
		return false;
	}

	return true;

}