feat: Perform staticcall to CallbackVerifier

foundry/interfaces/ICallbackVerifier.sol

@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: UNLICENSED
+pragma solidity ^0.8.28;
+
+interface ICallbackVerifier {
+    error UnauthorizedCaller(string exchange, address sender);
+
+    /**
+     * @dev This method should revert if the sender is not a verified sender of the exchange.
+     */
+    function verifyCallback(address sender, bytes calldata data)
+        external
+        returns (
+            uint256 amountOwed,
+            uint256 amountReceived,
+            address tokenOwed,
+            uint16 dataOffset
+        );
+}