EIP.sol

interface IERC6000 {
    /// @notice Emitted when a subscription expiration changes
    /// The zero address for subscriber indicates that the subscription was canceled.
    /// @dev When a subscription is canceled, the expiration value should also be 0.
    event SubscriptionUpdate(address indexed subscriber, uint256 indexed tokenId, uint256 expiration);

    /// @notice Renews the subscription to an NFT
    /// Throws if `tokenId` is not a valid NFT
    /// @param tokenId The NFT to renew the subscription for
    function renewSubscription(uint256 tokenId) external payable;

    /// @notice Cancels the subscription of an NFT
    /// @dev Throws if `tokenId` is not a valid NFT
    /// @param tokenId The NFT to cancel the subscription for
    function cancelSubscription(uint256 tokenId) external;

    /// @notice Gets the expiration date of a subscription
    /// @dev Throws if `tokenId` is not a valid NFT
    /// @param tokenId The NFT to get the expiration date of
    /// @return The expiration date of the subscription
    function expiresAt(uint256 tokenId) external view returns(uint256);
}