A custom fee in Signa value. You can use this to override automatic calculation.
The binary hexadecimal message to be sent. You can either send a text or hex message, but not both
The plain message string, i.e. text, stringified json or other human readable string.
The recipients public key. It cannot be the numeric Id, i.e. the receiving account must be activated in the network
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Wallet.sendEncryptedMessage