FungibleTokenPacketData defines a struct for the packet payload See FungibleTokenPacketData spec: https://github.com/cosmos/ibc/tree/master/spec/app/ics-020-fungible-token-transfer#data-structures
the token denomination to be transferred
the token amount to be transferred
the sender address
the recipient address on the destination chain
FungibleTokenPacketData defines a struct for the packet payload See FungibleTokenPacketData spec: https://github.com/cosmos/ibc/tree/master/spec/app/ics-020-fungible-token-transfer#data-structures