Macros

MESSAGE_RECEIVED_HOOK - define function handler which receives message, e.g., issue or transfer token to user

MESSAGE_RECEIVED_FAILURE_HOOK - define function handler which receives failed message, e.g., mark message as failed and add to failed message table

MESSAGE_RECEIPT_HOOK - define function handler which receives receipt, e.g., return tokens to sender, transfer failed

MESSAGE_RECEIPT_FAILURE_HOOK - define function handler which receives failed receipt, .e.g., mark receipt as failed and add to failed message table

LINK_INIT_METHODS - defines methods for link