wcus_ttn_form_payer_type

Allows to change shipment payer when creating TTN. Default value depends on option in plugin settings menu (in section Invoice).

Example of usage:

/**
 * @var string $payerType - Current shipment payer (provided from plugin settings)
 * @var \WC_Order $order - WooCommerce order for which TTN creating
 */
add_filter('wcus_ttn_form_payer_type', function ($payerType, $order) {
    return 'Sender';
}, 10, 2);

Available values for $payerType: Sender or Recipient