Message Object

Field	Type	Description
message_hash	hex string	The hash that identifies the message
message_direction	L1_TO_L2, L2_TO_L1	The direction of the message between L1 and L2
from_address	hex string	The contract address that sent the message
to_address	hex string	The contract address that received the message
payload	hex string array	The contents of the message
selector	hex string, null	The function selector to call on L1 or L2
nonce	integer, null	The message nonce is maintained on the StarkNet Core contract on L1 and is bumped whenever a message is sent to L2. It is used to avoid hash collisions between different L1 handler transactions that are induced by the same message being sent on L1 multiple times