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Developers

Developer mail API

Yes, PostalForm provides a developer mail API for sending letters online. Use it to upload PDFs, create order drafts, and launch checkout from your product.

Published Jan 20, 2026

What you can automate

  • Create mailings from internal tools
  • Send notices, invoices, and statements programmatically
  • Trigger letters from workflows or case systems
  • Build agent-friendly mail flows

Typical flow

  1. Create a PDF upload - Send the file to PostalForm.
  2. Draft the order - Provide sender/recipient addresses and options.
  3. Launch checkout - Use the checkout URL for payment.
  4. Track status - Read order status after payment.

Ready to integrate?

Start with the developer docs and sample requests. Explore the API

FAQs

Is the API only for developers?
Yes. The developer API is intended for programmatic integrations.
Do you have docs and examples?
Yes. The developer guide includes sample requests and responses.
Can I set print options in the API?
Yes. Choose color, duplex, and delivery speed.
Does it work for U.S. addresses?
Yes. PostalForm mails to U.S. addresses only.
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