include method to check fee

src/SendIt.sol

@@ -46,6 +46,10 @@ contract SendIt is Ownable {
     User
     **************************/
 
+    function getFee() external view returns (uint256) {
+        return usageFee;
+    }
+
     function updateVault(address vaultAddress) external {
         addressVault[msg.sender] = vaultAddress;
     }