post
https://api.tablelist.com/2025-03/venues//admission-groups/bulk-pos-tickets
Request body includes optional mode (default append). append: new tickets are merged onto existing posTickets. overwrite: posTickets for each reservation becomes exactly the tickets sent for that reservation (idempotent full sync). Multiple lines for the same reservation combine tickets in request order before merge/replace. Optional closed: last line per reservation wins.
