Endpoint to return all synced channels for given member id

[drillprop]

Context: Let’s say we have a member, who has 4 atlas channels. Two of these channels are already synced with youtube. In the design, once a user clicks the sign-up button, we’re should show a dialog with channels that aren’t synced with youtube. Here is the flow: https://www.figma.com/file/oQqFqdAiPu16eeE2aA5AD5/YouTube-Partner-Program?node-id=1637%3A121102&t=jd7OSusYewdF0XSm-4 (read Adam’s description on the left)

Problem: The problem is that I need to send 4 requests(GET /channels/id) for each channel to get this data and check if this channel already exists in DB(synced with youtube).

Suggestion: Could we improve this, and add a query that will return a list of channels that are already synced with youtube for a given member id?

[dmtrjsg]

Optimisation task, low prio, not needed for launch