I am trying to figure out how to add a user to a list using the REST API and not the Soap API. I am unsure why the REST API has different functionality that the Soap API.
I would like to add a subscriber to a List that I created like shown in this doc:
However I cannot find the equivalent in REST API. The closest I can find is
POST /contacts/v1/contacts https://developer.salesforce.com/docs/atlas.en-us.noversion.mc-apis.meta/mc-apis/createContacts.htm
which I think is different as I cannot specify to which list to subscribe.