API reference Quittio\Core\Data\Delivery quittio/core# Quittio\Core\Data\Delivery DeliveryDelivery information (BG-13). PeriodInvoicing period (BG-14: BT-73, BT-74) or invoice line period (BG-26: BT-134, BT-135). At least one of start or end must be set; the end must not lie before the start.