Limits

Things you might expect that aren't available yet:

• No automatic retries for sends. If WhatsApp fails a send, you get a 502 and decide what to do. There are no idempotency keys yet.
• No global search. q= works per request; very large histories get slower.
• No broadcast endpoint. You can send to a group JID, but there's no "send to many" call.
• No mark-as-read endpoint, and reading marks as read. Messages are marked as read when they are fetched, so senders may see blue ticks once your app reads them.
• No send throttling. The service doesn't slow your sends down; pace bulk sending yourself.
• No poll tally endpoint. Count poll votes in your code.