I need to be able to make calls to the nationbuilder API inside of a nationbuilder theme on behalf of the current user. Is there a way to get an API token for the user inside of a template? I see there's _nbuild_token and _nbuild_session cookies, but those don't work as API access tokens. I don't see any liquid template variables that look like they would be useful in getting an access token for the current user. Alternatively, I can set up a REST server that can make calls to the nationbuilder API, and make requests to that from my template. However, I need some way to verify who the user is that's making that call. If I send the _nbuild_token and/or _nbuild_session from the cookies along with the REST request, is there some way to verify which user_id that token belongs to on the backend? I just need some way to validate that the user making the request is a logged-in user on my nationbuilder site so I know what they should or shouldn't have access to.