diff --git a/src/contracts/Grateful.sol b/src/contracts/Grateful.sol
index 74fcbb9..cb570f6 100644
--- a/src/contracts/Grateful.sol
+++ b/src/contracts/Grateful.sol
@@ -46,8 +46,9 @@ contract Grateful is IGrateful, Ownable2Step {
     _;
   }
 
-  constructor(address[] memory _tokens, IPool _aavePool) Ownable(msg.sender) {
+  constructor(address[] memory _tokens, IPool _aavePool, uint256 _initialFee) Ownable(msg.sender) {
     aavePool = _aavePool;
+    fee = _initialFee;
     for (uint256 i = 0; i < _tokens.length; i++) {
       tokensWhitelisted[_tokens[i]] = true;
       IERC20(_tokens[i]).approve(address(_aavePool), type(uint256).max);
@@ -209,8 +210,8 @@ contract Grateful is IGrateful, Ownable2Step {
   }
 
   function applyFee(uint256 amount) public view returns (uint256) {
-    uint256 fee = (amount * 100) / 10_000;
-    return amount - fee;
+    uint256 feeAmount = (amount * fee) / 10_000;
+    return amount - feeAmount;
   }
 
   /**
@@ -249,4 +250,8 @@ contract Grateful is IGrateful, Ownable2Step {
 
     emit PaymentProcessed(_sender, _merchant, _token, _amount, yieldingFunds[_merchant], _paymentId, _subscriptionId);
   }
+
+  function setFee(uint256 _newFee) external onlyOwner {
+    fee = _newFee;
+  }
 }
diff --git a/test/integration/IntegrationBase.sol b/test/integration/IntegrationBase.sol
index 6cde60b..0b71bc4 100644
--- a/test/integration/IntegrationBase.sol
+++ b/test/integration/IntegrationBase.sol
@@ -27,6 +27,7 @@ contract IntegrationBase is Test {
   IGrateful internal _grateful;
   AaveV3Vault internal _vault;
   uint256 internal _amount = 10 * 10 ** 6; // 10 DAI
+  uint256 internal _fee = 100;
 
   function setUp() public {
     vm.startPrank(_owner);
@@ -34,7 +35,7 @@ contract IntegrationBase is Test {
     vm.label(address(_vault), "Vault");
     _tokens = new address[](1);
     _tokens[0] = address(_usdc);
-    _grateful = new Grateful(_tokens, _aavePool);
+    _grateful = new Grateful(_tokens, _aavePool, _fee);
     _vault = new AaveV3Vault(
       ERC20(address(_usdc)),
       ERC20(_aUsdc),