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This walkthrough creates a registered letter (shipType=2) and tracks it.

1. Check your balance

Response

2. Validate before paying (optional)

Send test=1 to validate the payload and PDF without creating the order or charging credits.

3. Create the order

Drop test=1 to actually submit. The data field returns the order’s visual id — store it.
Response

4. Track the order

The status field follows this lifecycle:
Once tracking is populated, you can follow the Correios tracking code, and download the submitted PDF, envelope front, return receipt (AR) or sender’s copy via /api/v2/download/{securityToken}/{job_id}/{type}.