Comment by kdodhia

It doesn't sit there blocked. The call comes back right away with a pending status and an approval id, so the agent can tell the user "this needs sign off from X" and get on with other stuff. Then you either await it inline with a timeout or stash the id and have a worker poll it later. Once it's approved we run the exact request that was approved and the agent gets the provider's response back. If nobody answers in time it expires (10 min by default, you can set it up to 24h) and the agent has to make the call again.