Use the first-mile sequence endpoint to run a complete, supported first-mile (or return) lifecycle in one call, instead of triggering each status individually.
- Do not send
event_type; the service chooses the sequence based onprovider_name,carrier_name, andshipment_type. - Set
labellesstotrueonly for combinations GLS/NXT has confirmed as label-less. - Events arrive asynchronously through your webhooks; the response only confirms the sequence was accepted.