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Setting Up The Callback

Override uniswapV3FlashCallback with the arbitrage logic. 
    function uniswapV3FlashCallback(
        uint256 fee0,
        uint256 fee1,
        bytes calldata data
    ) external override {
Decode the data and validate the callback origin: 
        FlashCallbackData memory decoded = abi.decode(data, (FlashCallbackData));
        CallbackValidation.verifyCallback(factory, decoded.poolKey);
Approve the router and set minimum output amounts (borrowed + fees) so swaps revert if unprofitable: 
        address token0 = decoded.poolKey.token0;
        address token1 = decoded.poolKey.token1;

        TransferHelper.safeApprove(token0, address(swapRouter), decoded.amount0);
        TransferHelper.safeApprove(token1, address(swapRouter), decoded.amount1);

        uint256 amount1Min = LowGasSafeMath.add(decoded.amount1, fee1);
        uint256 amount0Min = LowGasSafeMath.add(decoded.amount0, fee0);

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Executing The Swaps

Swap the flash-borrowed tokens in pools with different fee tiers: 
uint256 amountOut0 =
            swapRouter.exactInputSingle(
                ISwapRouter.ExactInputSingleParams({
                    tokenIn: token1,
                    tokenOut: token0,
                    fee: decoded.poolFee2,
                    recipient: address(this),
                    deadline: block.timestamp + 200,
                    amountIn: decoded.amount1,
                    amountOutMinimum: amount0Min,
                    sqrtPriceLimitX96: 0
                })
            );

uint256 amountOut1 =
            swapRouter.exactInputSingle(
                ISwapRouter.ExactInputSingleParams({
                    tokenIn: token0,
                    tokenOut: token1,
                    fee: decoded.poolFee3,
                    recipient: address(this),
                    deadline: block.timestamp + 200,
                    amountIn: decoded.amount0,
                    amountOutMinimum: amount1Min,
                    sqrtPriceLimitX96: 0
                })
            );

​
Paying Back The Pool And Collecting Profits

uint256 amount0Owed = LowGasSafeMath.add(decoded.amount0, fee0);
uint256 amount1Owed = LowGasSafeMath.add(decoded.amount1, fee1);

TransferHelper.safeApprove(token0, address(this), amount0Owed);
TransferHelper.safeApprove(token1, address(this), amount1Owed);

if (amount0Owed > 0) pay(token0, address(this), msg.sender, amount0Owed);
if (amount1Owed > 0) pay(token1, address(this), msg.sender, amount1Owed);

    if (amountOut0 > amount0Owed) {
            uint256 profit0 = LowGasSafeMath.sub(amountOut0, amount0Owed);

            TransferHelper.safeApprove(token0, address(this), profit0);
            pay(token0, address(this), decoded.payer, profit0);
        }

    if (amountOut1 > amount1Owed) {
            uint256 profit1 = LowGasSafeMath.sub(amountOut1, amount1Owed);
            TransferHelper.safeApprove(token0, address(this), profit1);
            pay(token1, address(this), decoded.payer, profit1);
        }