Limits
Batch sizes, token lifetime, key format and timing.
Shipments per call
One call to Process shipments can carry between 1 and 100 shipments.
- An empty array is rejected with
400 Bad Request. - More than 100 shipments is rejected with
400 Bad Request, with the detailLimited to 100 shipments per request.
Access tokens
An access token from Client login is valid for 4 hours.
Idempotency keys
- 8 to 128 characters of letters, digits, underscore, dot, colon or hyphen.
- One header per request.
- Remembered for 30 days.
Label generation time
Allow up to 1 second per item for label generation. Speed depends on the carrier.
Field lengths
Each field's maximum length is listed in the API reference, next to its type.