Add service receipt contract scaffold

Author: lippytm

contracts/contracts/ServiceReceipt.sol

@@ -0,0 +1,65 @@
+// SPDX-License-Identifier: ISC
+pragma solidity ^0.8.24;
+
+contract ServiceReceipt {
+    struct Receipt {
+        uint256 id;
+        address customer;
+        string productCode;
+        string deliveryState;
+        string metadataUri;
+        uint256 createdAt;
+        bool active;
+    }
+
+    address public owner;
+    uint256 public nextReceiptId = 1;
+    mapping(uint256 => Receipt) public receipts;
+
+    event ReceiptCreated(uint256 indexed id, address indexed customer, string productCode);
+    event DeliveryStateUpdated(uint256 indexed id, string deliveryState);
+    event ReceiptDeactivated(uint256 indexed id);
+
+    modifier onlyOwner() {
+        require(msg.sender == owner, "Only owner can perform this action");
+        _;
+    }
+
+    constructor() {
+        owner = msg.sender;
+    }
+
+    function createReceipt(
+        address customer,
+        string memory productCode,
+        string memory deliveryState,
+        string memory metadataUri
+    ) external onlyOwner returns (uint256) {
+        uint256 receiptId = nextReceiptId;
+        receipts[receiptId] = Receipt({
+            id: receiptId,
+            customer: customer,
+            productCode: productCode,
+            deliveryState: deliveryState,
+            metadataUri: metadataUri,
+            createdAt: block.timestamp,
+            active: true
+        });
+
+        nextReceiptId += 1;
+        emit ReceiptCreated(receiptId, customer, productCode);
+        return receiptId;
+    }
+
+    function updateDeliveryState(uint256 receiptId, string memory deliveryState) external onlyOwner {
+        require(receipts[receiptId].active, "Receipt is not active");
+        receipts[receiptId].deliveryState = deliveryState;
+        emit DeliveryStateUpdated(receiptId, deliveryState);
+    }
+
+    function deactivateReceipt(uint256 receiptId) external onlyOwner {
+        require(receipts[receiptId].active, "Receipt already inactive");
+        receipts[receiptId].active = false;
+        emit ReceiptDeactivated(receiptId);
+    }
+}