A callback which is called when the send message request fails. The message given to the callback is a failed message that possibly gets re-sent if applicable.
A callback which is called immediately after the send message request. The message given to the callback is a pending message that is not sent yet (messageId === 0).
A callback which is called when the send message request succeeds. The message given to the callback is a succeeded message.
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Description
Represent send message request handler.