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The AuthorizationEngine is not upgradeable.
Pause There are no functionalities to put in pause the contracts.
The AuthorizationEngine supports client-side gasless transactions using the Gas Station Network (GSN) pattern, the main open standard for transfering fee payment to another account than that of the transaction issuer. The contract uses the OpenZeppelin contract ERC2771Context, which allows a contract to get the original client with _msgSender() instead of the fee payer given by msg.sender .
At deployment, the parameter forwarder inside the contract constructor has to be set with the defined address of the forwarder. Please note that the forwarder can not be changed after deployment.
Please see the OpenGSN documentation for more details on what is done to support GSN in the contract.
