initial draft of EVM gateway

packages/hardhat/contracts/payWithEth.sol

@@ -0,0 +1,45 @@
+// SPDX-License-Identifier: MIT
+pragma solidity ^0.8.0;
+
+// TODO in production
+import "hardhat/console.sol";
+// import "@openzeppelin/contracts/";
+// import "@openzeppelin/contracts/access/Ownable.sol";
+
+interface SecretContract {
+    function makeRef(string calldata encrypteSecret) external returns (string memory);
+    function pay(string calldata ref, uint256 amout) external returns (uint256);
+    function withdraw(string calldata encrypteSecret, address withdrawalAddress) external returns (uint256);
+}
+
+/**
+ * @author
+ */
+contract PayWithEth {
+
+    SecretContract secretContact;
+
+    function makeRef(string calldata encryptedSecret) public returns (string memory){
+        string memory ref = secretContact.makeRef(encryptedSecret);
+        return ref;
+    }
+
+    function pay(string calldata ref) public payable returns (uint256) {
+        // TODO replace with proper type for proofs
+        uint256 paymentProof = secretContact.pay(ref, msg.value);
+        require(paymentProof > 0, "Payment reference not found");
+        return paymentProof;
+    }
+    // useful? 
+    // function payEncrypted(string EncryptedRef) payable {
+    //     secretContact.pay()
+    // }
+
+    receive() external payable {}
+
+    function withdraw(string calldata encryptedSecret, address payable withdrawalAddress) public {
+        uint256 amount = secretContact.withdraw(encryptedSecret, withdrawalAddress);
+        require(amount > 0, "Account not found or empty.");
+        withdrawalAddress.transfer(amount);
+    }
+}