Woocommerce Opayo Payments Custom VendorTXCode

functions.php

//This function adds last name and the time, then a random number afterwards

add_filter( 'woocommerce_opayopi_vendortxcode', 'custom_vendor_tx_code', 10, 2);

function custom_vendor_tx_code($vendortxcode, $order) {
	$vendortxcode = time().$order->get_billing_last_name().rand(0,999 );

	$vendortxcode = preg_replace( '/[^0-9a-zA-Z_\-]/', "", $vendortxcode );

	// Make sure it's not over 40 characters
	if ( strlen($vendortxcode) > 40 ) {
		$vendortxcode = substr( $vendortxcode, 0, 40 );
	}

	return $vendortxcode;
}