# The IERC3009 interface is not fully conforming to the standard Low/Info · Three Sigma · Stablecoin framework · 8th January, 2024 Finding 3S-M^0-N17 of the M^0 Minter Gateway security review. - Protocol: https://www.m0.org/ - Report: /reports/m-0 - Codebase: https://github.com/0xsimao/ttg/tree/a8127901fa1f24a2e821cf4d9854a1aa6ac8088c - Source: https://cdn.sanity.io/files/qoqld077/production/1cdafafad874aba76e062ad8c216c98338c096db.pdf --- ### Description The [IERC3009](https://github.com/MZero-Labs/common/blob/4a37119f2da946c6d8ad7b9a70dfdd219225115b/src/interfaces/IERC3009.sol) defines a token interface following the EIP3009 standard. The interface is not fully conforming to the standard and it's missing the following mandatory view functions: - TRANSFER_WITH_AUTHORIZATION_TYPEHASH - RECEIVE_WITH_AUTHORIZATION_TYPEHASH Because the interface is also adding the optional canceling functions from EIP3009, it should also be defining the CANCEL_AUTHORIZATION_TYPEHASH view function. ### Recommendation Though the [ERC3009](https://github.com/MZero-Labs/common/blob/4a37119f2da946c6d8ad7b9a70dfdd219225115b/src/ERC3009.sol) contract does implement these functions, it is still recommended that the interface implements them as well. ### Status Addressed in [#ab7366e](https://github.com/MZero-Labs/common/commit/ab7366e1616f397d4ac2f6abda7537e42894d8be).