private RawTransaction createFrontierTransaction() {
    return RawTransaction.createEtherTransaction(
        getNonce(),
        gasPrice,
        INTRINSIC_GAS,
        recipient.getAddress(),
        Convert.toWei(transferAmount, transferUnit).toBigIntegerExact());
  }
Number of GAS units that the transaction will cost.
acceptance-tests/dsl/src/main/java/org/hyperledger/besu/tests/acceptance/dsl/transaction/account/TransferTransaction.java