Empty Base Message
    Properties
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                  The flag that indicates whether the message is resendable.
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                  The Open Graph metadata of the message.
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                  The reactions of the message.
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                  The request id of the message. This is used to identify the message when the message is not sent yet (sendingStatus != SendingStatus.SUCCEEDED)
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                  The sender of the message.
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                  The sending status of the message.
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                  The undelivered member count of the message.
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                  The unread member count of the message.