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Error - User op cannot be replaced: fee too low. If you’re getting the User op cannot be replaced: fee too low error, it means that the gas price you set is too low. You can increase the gas price by setting the TxOptions parameter when sending a transaction. To replace an user operation, a new user operation must have at least 10% higher maxPriorityFeePerGas and 10% higher maxPriorityFeePerGas than the one in the user operation mempool. To replace the user operation, the new gas price must be at least 10% higher. 
final res = await fuseSDK.transferToken(
    EthereumAddress.fromHex('TOKEN_ADDRESS'),
    EthereumAddress.fromHex('RECIPIENT_ADDRESS'),
    BigInt.parse('AMOUNT_IN_WEI'),
    FuseSDK.defaultTxOptions.copyWith(
      feePerGas: '11000000000',
      withRetry: true,
      feeIncrementPercentage: 11,
    ),
);
print('UserOpHash: ${res.userOpHash}');
print('Waiting for transaction...');
final ev = await res.wait();