Caller is the address of the caller authenticated by the consensus layer.
OptionaldataData is a runtime transaction.
OptionalfeeFee is the fee sent into the runtime as part of the message being sent. The fee is transferred before the message is processed by the runtime.
ID is the unique identifier of the message.
OptionaltagTag is an optional tag provided by the caller which is ignored and can be used to match processed incoming message events later.
OptionaltokensTokens are any tokens sent into the runtime as part of the message being sent. The tokens are transferred before the message is processed by the runtime.
IncomingMessage is an incoming message.