Document which account group_buy subscriptions end up on

[knivets]

Subscriptions API doesn't return any results for subscriptions purchased via group_by.
I'm talking about this API endpoint: http://localhost:8000/api/profile/cowork/subscriptions

[smirolo]

If you buy a Subscription using the "group buy" feature, you are effectively buying a subscriptions for another account (i.e. payer != subscriber) so it makes sense you do not see that subscription listed under the payer account. It should be listed under the beneficiary account.

[smirolo]

To close when documentation is updated.