Dylan Herrada writes in this Adafruit tutorial:

Submitting an open-source project to OSHWA

OSHWA (Open Source Hardware Association) is an organization that, among other things, has created and maintains a process to allow users and companies to certify that their projects are open source. This past spring, many of the boards that Adafruit manufactures were certified. Those certifications were submitted semi-manually, which took quite a while. Now, OSHWA has an API that allows you to submit projects much quicker and can make submitting large numbers of projects at the same time much easier and more straightforward.

In this guide, you’ll learn how to submit your open-source project for certification using this API and a Python script. It’ll will take you through the process used by Adafruit to submit a project.