Payment for products of online stores (Woocommerce) through the LiqPay service. Works in conjunction with the Woocommerce plugin.
Now you can use the filter:
add_filter('wc_liqpay_request_filter', 'modify_request');
function modify_request($request) {
// Modify the $request array here
$request['version'] = '3';
return $request;
}