SecureTrading for WooCommerce - Filter the billingtelephonetype

wc-securetrading-filter-billingtelephonetype.php

/**
 * WooCommerce - SecureTrading payment gateway
 * Filter the billingtelephonetype sent to SecureTrading
 *
 **/

add_filter('securetrading_billing_phone_type', 'my_securetrading_billing_phone_type');

function my_securetrading_billing_phone_type( ) {
	// Available Phone Types are H (Home), W (Work), M (Mobile)
	return 'H';
}