# GLV Liquidity Exercises In this exercise, you will implement a Solidity smart contract for interacting with the GLV pools. You'll complete 3 main tasks in the `GlvLiquidity.sol` contract: 1. Receive execution fee refunds 2. Create deposit orders to add USDC liquidity to GLV vaults 3. Create withdrawal orders to remove liquidity and receive WETH and USDC tokens ## Task 1: Implement fee refund mechanism Create a function to receive execution fee refunds from the GMX protocol. ## Task 2: Implement deposit functionality ```solidity // Task 2 - Create an order to deposit USDC into GLV vault function createGlvDeposit(uint256 usdcAmount, uint256 minGlvAmount) external payable returns (bytes32 key) { uint256 executionFee = 0.1 * 1e18; usdc.transferFrom(msg.sender, address(this), usdcAmount); // Task 2.1 - Send execution fee to GLV vault // Task 2.2 - Send USDC to GLV vault // Task 2.3 - Create an order to deposit USDC } ``` Complete the `createGlvDeposit` function to create a deposit order for `GLV_VAULT`. ### Task 2.1: Send the execution fee to the GLV vault Send the execution fee to the GLV vault. ### Task 2.2: Send USDC tokens to the GLV vault Approve the `ROUTER` contract and send USDC to the GLV vault. ### Task 2.3: Create an order to deposit USDC Create an order to deposit liquidity into `GM_TOKEN_ETH_WETH_USDC`. Return the order key. > Hint: > > - Set `glv` to `GLV_TOKEN_WETH_USDC` ## Task 3: Implement withdrawal functionality ```solidity // Task 3 - Create an order to withdraw liquidity function createGlvWithdrawal(uint256 minWethAmount, uint256 minUsdcAmount) external payable returns (bytes32 key) { uint256 executionFee = 0.1 * 1e18; // 3.1 Send execution fee to GLV vault // 3.2 - Send USDC to GLV vault // 3.3 Create an order to withdraw liquidity } ``` Complete the `createGlvWithdrawal` function to: ### Task 3.1: Send the execution fee to the GLV vault Send the execution fee to the GLV vault. ### Task 3.2: Send GLV tokens to the GLV vault Approve the `ROUTER` contract and send GLV token to the GLV vault. ### Task 3.3: Create an order to withdraw liquidity and receive WETH and USDC Create an order to withdraw liquidity from `GM_TOKEN_ETH_WETH_USDC`. Return the order key. > Hint: > > - Set `glv` to `GLV_TOKEN_WETH_USDC` ## Test ```shell forge test --fork-url $FORK_URL --fork-block-number $FORK_BLOCK_NUM --match-path test/GlvLiquidity.test.sol -vvv ```