Currently the only way to do this is manually by either doing online of offline activation.
https://documentation.solarwinds.com/en/Success_Center/DPA/Content/DPA-Activate-your-licenses.htm
I would like a way to do at least online activation through the rest API as I am basically putting in the same information every time. (Key, number to add/remove, then my contact information (Name, email, phone number, company)).
Offline would be a nice to have, but I understand if this remains to a later version as this is probably a more difficult request to work with.