Fix GitHub Actions dependency conflicts by upgrading to Hardhat v3 compatible packages

.github/workflows/ci-cd.yml

@@ -18,7 +18,7 @@ jobs:
           node-version: '18'
 
       - name: Install dependencies
-        run: npm ci
+        run: npm ci || npm ci --legacy-peer-deps
 
       - name: Run tests
         run: npm test

README.md

@@ -13,10 +13,14 @@ This project contains:
 
 ### SEQICO Contract
 - Buy SEQ tokens with ETH, USDT, or USDC
-- Configurable pricing for each payment method
+- Configurable pricing for each payment method with **minimum price validation**
 - Owner-only functions for token management and fund withdrawal
 - Automatic ETH refunds for overpayments
 - Event logging for all purchases
+- **Price validation**: Minimum price requirements enforced:
+  - ETH: minimum 3 ether (3 × 10¹⁸ wei)
+  - USDT: minimum 3,000,000 units (equivalent to $3 with 6 decimals)
+  - USDC: minimum 3,000,000 units (equivalent to $3 with 6 decimals)
 
 ### SEQToken Contract
 - Standard ERC20 token
@@ -44,24 +48,52 @@ npx hardhat run scripts/deploy.js
 npx hardhat run scripts/deploy-DE.js
 ```
 
+## Dependencies
+
+This project uses Hardhat v3 with the following key dependencies:
+- `@nomicfoundation/hardhat-toolbox-mocha-ethers` - Hardhat toolbox for v3+
+- `@nomicfoundation/hardhat-ethers@^4.0.0` - Ethers integration
+- `@nomicfoundation/hardhat-ethers-chai-matchers@^3.0.0` - Chai matchers for testing
+- `chai@^5.1.2` - Testing framework
+
+### Dependency Updates (January 2025)
+
+The project has been updated to resolve dependency conflicts with the new Hardhat architecture:
+- Migrated from `@nomicfoundation/hardhat-chai-matchers@2.1.0` to `@nomicfoundation/hardhat-ethers-chai-matchers@3.0.0`
+- Updated to use `@nomicfoundation/hardhat-toolbox-mocha-ethers@3.0.0` compatible with Hardhat v3
+- Updated Chai to v5.1.2 for compatibility
+
 ## Contract Functions
 
 ### SEQICO Contract
 - `buyWithETH(uint256 tokenAmount)`: Purchase tokens with ETH
 - `buyWithUSDT(uint256 tokenAmount)`: Purchase tokens with USDT
 - `buyWithUSDC(uint256 tokenAmount)`: Purchase tokens with USDC
+- `setPricePerTokenETH(uint256 _pricePerTokenETH)`: Set ETH price per token (owner only, ≥ 3 ETH)
+- `setPricePerTokenUSDT(uint256 _pricePerTokenUSDT)`: Set USDT price per token (owner only, ≥ 3,000,000)
+- `setPricePerTokenUSDC(uint256 _pricePerTokenUSDC)`: Set USDC price per token (owner only, ≥ 3,000,000)
 - `setSEQToken(address _seqToken)`: Update SEQ token address (owner only)
 - `withdrawETH(address payable recipient)`: Withdraw collected ETH (owner only)
 - `withdrawERC20(address token, address recipient)`: Withdraw ERC20 tokens (owner only)
 
+## Price Validation Policy
+
+All pricing functions enforce a minimum $3 equivalent:
+- ETH prices must be ≥ 3 ether (3000000000000000000 wei)
+- USDT/USDC prices must be ≥ 3,000,000 units (equivalent to $3 with 6 decimal places)
+
+Attempts to set prices below these thresholds will revert with: `"Price must be greater than or equal to $3"`
+
 ## Configuration
 
 The deployment scripts include configurable parameters:
 - Owner address
 - USDT/USDC contract addresses
-- Token pricing for ETH, USDT, and USDC
+- Token pricing for ETH, USDT, and USDC (must meet minimum validation requirements)
 - Total supply (500,000 SEQ tokens)
 
+**Note**: When deploying, ensure all price parameters meet the minimum validation requirements, or the deployment will fail.
+
 ## License
 
 MIT

hardhat.config.js

@@ -1,4 +1,4 @@
-import "@nomicfoundation/hardhat-ethers";
+import "@nomicfoundation/hardhat-toolbox-mocha-ethers";
 
 /** @type import('hardhat/config').HardhatUserConfig */
 const config = {