API Integration
Getting Started
If you're looking to integrate mailing services into your own software or workflow, this article explains the availability of an API and what is required to use it.
In This Article
API Availability
OnlineCertifiedMail.com does not offer a direct API on this website.
However, an API is available through its parent company, LetterStream. This API allows you to submit mailing jobs programmatically through LetterStream’s system.
General Requirements
To use the LetterStream API, here are a few things to keep in mind:
- Your system must be able to generate PDF and CSV files
- Mailings are not processed until paid for
- Use the PrePay option and enable a Low Balance Alert for a seamless experience
- A developer is required—whether in-house or contracted—to complete the integration
Next Steps
If you are interested in integrating with the API, create a free LetterStream account and reach out to support for more information.