External
data class ExternalFeePayerRequest(val transactionBytes: ByteArray, val senderAuthenticatorBytes: ByteArray, val additionalSignersAuthenticatorBytes: List<ByteArray> = emptyList(), val fingerprint: String)
Opaque BCS values accepted by an external Aptos Gas Station.
transactionBytes is the RawTransactionWithData::FeePayer value signed by the sender, not a partially assembled SignedTransaction. The external sponsor supplies its address and authenticator before submitting the final transaction.