Text of a message. Max length is 1000 symbols (2-byte UTF-16 encoded). If a character is encoded in 4 bytes in UTF-16 it is treated as 2 characters, thus restricting the maximum message length to 500 symbols
Receiver of an SMS message. The phoneNumber property must be filled
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Sender of an SMS message. The phoneNumber property must be filled to correspond to one of the account phone numbers which is allowed to send SMS