Validate your consignment note JSON.
The same two layers as POST /v1/shipments: the canonical model and the business rule register. You get errors per field, warnings and the country rules of the lane. Nothing is stored.
Shipment (JSON)
Examples
Edit the JSON or pick an example alongside.
Just confirming you are not a bot:
What you paste here is not stored: no shipment, no version, no log line with content.
Result
Press Validate to check the shipment.
Works? Keep building with a sandbox key.
The same validation, plus issuing, signatures and webhooks. Test keys are free and run against the same API as production.