Modular payments gateway

.gitmodules

@@ -4,3 +4,9 @@
 [submodule "lib/openzeppelin-contracts"]
 	path = lib/openzeppelin-contracts
 	url = https://github.com/OpenZeppelin/openzeppelin-contracts
+[submodule "lib/modular-contracts"]
+	path = lib/modular-contracts
+	url = https://github.com/thirdweb-dev/modular-contracts
+[submodule "lib/solady"]
+	path = lib/solady
+	url = https://github.com/vectorized/solady

src/ModularPaymentsGateway.sol

@@ -0,0 +1,32 @@
+// SPDX-License-Identifier: Apache-2.0
+pragma solidity ^0.8.22;
+
+import { ModularCore } from "lib/modular-contracts/src/ModularCore.sol";
+import { Initializable } from "lib/solady/src/utils/Initializable.sol";
+
+contract ModularPaymentsGateway is ModularCore, Initializable {
+    constructor() {
+        _disableInitializers();
+    }
+
+    function initialize(
+        address _owner,
+        address[] memory _extensions,
+        bytes[] memory _extensionInstallData
+    ) external payable {
+        _initializeOwner(_owner);
+
+        // Install and initialize extensions
+        require(_extensions.length == _extensionInstallData.length);
+        for (uint256 i = 0; i < _extensions.length; i++) {
+            _installExtension(_extensions[i], _extensionInstallData[i]);
+        }
+    }
+
+    function getSupportedCallbackFunctions()
+        public
+        pure
+        override
+        returns (SupportedCallbackFunction[] memory supportedCallbackFunctions)
+    {}
+}