add_filter("woofood_minimum_amount_delivery_filter", "wpslash_minimum_delivery_hook_on_message", 10, 1);

function wpslash_minimum_delivery_hook_on_message($min_amount)
{
	global $woocommerce;
	$minimum = array();
	$minimum["4950"] = 20;
    $minimum["6153"] = 40;
    $minimum["4952"] = 40;
    $minimum["4938"] = 40;
    $minimum["4944"] = 40;
    $minimum["4955"] = 40;
    $minimum["4954"] = 40;
    $minimum["6144"] = 40;
    $minimum["4956"] = 40;
    $postalcode = str_replace(" ", "", $woocommerce->customer->get_billing_postcode());	
	if(array_key_exists($postalcode, $minimum))
	{
			return $minimum[$postalcode];

	}
	else{
		return $min_amount;
	}
	
	

}