Add interface for ERC6909

.changeset/long-walls-draw.md

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+---
+'openzeppelin-solidity': minor
+---
+
+`IERC6909`: Add the interface for the ERC6909.

contracts/interfaces/draft-IERC6909.sol

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+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (interfaces/draft-IERC6909.sol)
+
+pragma solidity ^0.8.20;
+
+import {IERC6909} from "../token/ERC6909/draft-IERC6909.sol";

contracts/token/ERC6909/draft-IERC6909.sol

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+// SPDX-License-Identifier: MIT
+// OpenZeppelin Contracts (token/ERC6909/draft-IRC6909.sol)
+
+pragma solidity ^0.8.20;
+
+import {IERC165} from "../../utils/introspection/IERC165.sol";
+
+/**
+ * @dev Required interface of an ERC-6909 compliant contract, as defined in the
+ * https://eips.ethereum.org/EIPS/eip-6909[ERC].
+ */
+interface IERC6909 is IERC165 {
+    /**
+     * @dev Emitted when the allowance of a `spender` for an `owner` is set by a call to `approve` for a
+     * token of type `id`. The new allowance is `amount`.
+     */
+    event Approval(address indexed owner, address indexed spender, uint256 indexed id, uint256 amount);
+
+    /**
+     * @dev Emitted when `owner` grants or revokes operator status for a `spender`.
+     */
+    event OperatorSet(address indexed owner, address indexed spender, bool isOperator);
+
+    /**
+     * @dev Emitted when `amount` tokens of type `id` are moved from `from` to `to` initiated by `caller`.
+     */
+    event Transfer(address caller, address indexed from, address indexed to, uint256 indexed id, uint256 amount);
+
+    /**
+     * @dev Returns the amount of tokens of type `id` owned by `owner`.
+     */
+    function balanceOf(address owner, uint256 id) external view returns (uint256);
+
+    /**
+     * @dev Returns the amount of tokens of type `id` that `spender` is allowed to spend on behalf of `owner`.
+     *
+     * NOTE: Does not include operator allowances.
+     */
+    function allowance(address owner, address spender, uint256 id) external view returns (uint256);
+
+    /**
+     * @dev Returns true if `spender` is set as an operator for `owner`.
+     */
+    function isOperator(address owner, address spender) external view returns (bool);
+
+    /**
+     * @dev Sets an approval to `spender` for `amount` tokens of type `id` from the caller's tokens.
+     *
+     * Must return true.
+     */
+    function approve(address spender, uint256 id, uint256 amount) external view returns (bool);
+
+    /**
+     * @dev Grants or revokes unlimited transfer permission of any token id to `spender` for the caller's tokens.
+     *
+     * Must return true.
+     */
+    function setOperator(address spender, bool isOperator) external returns (bool);
+
+    /**
+     * @dev Transfers `amount` of token type `id` from the caller's account to `to`.
+     *
+     * Must return true.
+     */
+    function transfer(address to, uint256 id, uint256 amount) external returns (bool);
+
+    /**
+     * @dev Transfers `amount` of token type `id` from `from` to `to`.
+     *
+     * Must return true.
+     */
+    function transferFrom(address from, address to, uint256 id, uint256 amount) external returns (bool);
+}