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A REST API with an OpenAPI description, signed webhooks, a test mode that runs the whole chain, and clients for Node and Python.

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Was Sie damit tun können

POST /api/v1/letters with text, a base64 PDF, or a URL to a PDF.
Webhooks on submitted, printed, posted, delivered, failed and refunded.
Test keys run everything, webhooks included, without printing or charging.

Verbinden

Create a key in your account.
Start on sk_test_ and switch over once it all works.
Send an idempotency key on anything that can be retried.

API documentation