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oneof payload
bytes encryptedTransportMessage = 2
Used in: BackupMessage
optional string senderID = 1
optional string messageID = 2
optional int64 timestampMS = 3
optional int32 payloadVersion = 5
optional int32 futureProofBehavior = 6
optional int32 threadTypeTag = 7
Used in: Metadata
optional bytes frankingTag = 3
optional bytes reportingTag = 4