// In migrate() function:
TransferHelper.safeApprove(params.token0, nonfungiblePositionManager, amount0V2ToMigrate);
TransferHelper.safeApprove(params.token1, nonfungiblePositionManager, amount1V2ToMigrate);

// In refund logic:
TransferHelper.safeApprove(params.token0, nonfungiblePositionManager, 0);
TransferHelper.safeApprove(params.token1, nonfungiblePositionManager, 0);
TransferHelper.safeIncreaseAllowance(params.token0, nonfungiblePositionManager, amount0V2ToMigrate);
TransferHelper.safeIncreaseAllowance(params.token1, nonfungiblePositionManager, amount1V2ToMigrate);
TransferHelper.safeDecreaseAllowance(params.token0, nonfungiblePositionManager, amount0V2ToMigrate);
TransferHelper.safeDecreaseAllowance(params.token1, nonfungiblePositionManager, amount1V2ToMigrate);
