Send a team chat message POST
Lab only, members only. The message id is `clientMessageId`: a retry returns the stored message with 200 and repeats no side effect. Attachments must be the caller's finalized, unsent uploads to this thread. Members are notified live; members who were caught up also get a content-free push.
List Transactions GET
Retrieve a paginated list of financial transactions (invoices, payments, credit notes, refunds) for the authenticated lab. Supports filtering by type, clinic, and date range.