A custom service will be executed. The filter $cdi_tracking = apply_filters ('cdi_custom_gateway_exec', $cdi_tracking=false , $cdi_nbrorderstodo , $cdi_rowcurrentorder, $array_for_carrier) is used. $array_for_carrier contains the datas to process with your software carrier. The parcel tracking code is returned in $cdi_tracking and will be automatically updated into the gateway panel. $cdi_nbrorderstodo and $cdi_rowcurrentorder are respectively the number of orders to process and the rank of the current order in process.