POST /swaps/user_names to replace the mailbox personas on one active
domain. Peeker uses the persona names to regenerate mailbox identities. The
domain, order, and workspace target stay in place.
For replacing the domain itself, see Domain swaps /
How swaps work.
Submit the new personas
first_name and last_name are required. profile_picture_url is
optional and is not applied to inboxes today.
The response contains the swap job created for the domain:
Track the rename
PollGET /swaps/{id} or subscribe to swap.created, swap.in_progress,
swap.completed, and swap.failed.