public static UnsignedTx CreateUnsignedContractCallTx(this FlatClient client, ILogger logger, string callerId, ulong nonce, string calldata, BigInteger?gasPrice, string contractId, BigInteger amount)
{
ushort abiVersion = Constants.BaseConstants.ABI_VERSION;
ulong ttl = 0;
ulong gas = 1579000;
ContractCallTransaction contractTx = client.CreateContractCallTransaction(abiVersion, calldata, contractId, gas, gasPrice ?? Constants.BaseConstants.MINIMAL_GAS_PRICE, nonce, callerId, ttl);
contractTx.Model.Amount = amount;
return(contractTx.CreateUnsignedTransaction());
}