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WhatsApp lets zapbip send free-form messages only within 24 hours of the last message from the owner. zapbip closes its own window 10 minutes early. A reaction from the owner does not open the window. While the window is open, messages go out at once with delivery: "sent". When it is closed:
  • the tool returns delivery: "queued" and the message waits in the outbound queue;
  • the first queued message sends the owner one approved notice, once per closed window;
  • the next message from the owner opens the window and flushes the queue in order;
  • queued messages older than 7 days become expired.
A send that the channel rejects is stored with delivery: "failed", and the tool returns an error naming the kind.