Hey Bert,
Currently, posting updates is done through the proxy for each individual service. See the documentation at
https://singly.com/proxy. In this way you are using the service's own interface to post updates, but we manage all of the access tokens.
We are working on a much better way of doing this that will allow more flexibility and ease of use in posting to multiple services, which should be available in a matter of weeks!
The "account value" comes from the original service that the user is authenticating with, so it can't be changed. You can use it mostly to delete individual services from the list of accounts Singly is managing.
The Singly access token is what you should associate with the user's account or session. The Singly access token will be constant no matter what services the user has authenticated. You can then use the /profiles endpoint to see what those services are.
Please ask any other questions you have. Our documentation is in its evolutionary phases, so all feedback is great helping us determine what is confusing!
Thanks,
Justin