Connect service with OAuth but no need to log the user in

In my app, I want to let my user link their meetup account. So I am relying on the meetup meteor package and call Meetup.requestCredential() which works fine to get the access token. Now, I need to save the access token to the user object (services.meetup) and I don’t know how to do it. I’m not quite sure to understand the magic behind the Account+OAuth process. Do I need to passe the accessToken through a Meteor.method ? Is it secure?

I am aware of this pull request and “bozhao/link-accounts” package but it seemed like to be not to far from my goal to start using an additional package.

Thanks for your help !