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# Reference

This part of the documentation contains reference material, including APIs, configuration values, and environment variables.

## Acumbamail

-   [Home page](https://acumbamail.com/).

-   [Official API Acumbamail Documentation](https://acumbamail.com/apidoc/).

-   The [addSubscriber](https://acumbamail.com/apidoc/function/addSubscriber/), is the Acumbamail endpoints that using.