Reset LicenseAnswered

Can you please tell me which method is used to reset a users or license key's activations. If a user has maxed their activations, how do I reset them back to 0 using the WebAPI. Which method is this?

Thanks so much!

I need a way to get the pkey_id from the License Key via web api. Users wanting to reset their license will not know the pley_id. How can I lookup the pkey_id of a license key via web api?

Never mind. I think I found it - limelm.pkey.getID