A.

Transaction.Error
Transaction.ErrorFriendlyMessage

Transaction.OriginalReturnString

Transaction.ID

NOTE: Document will always be an index of zero since there can currently only be one document per transaction

Transaction.Document(0).ID
Transaction.Document(0).URL
Transaction.Document(0).AccessToken

NOTE: The index of signer and Signature will depend on how many signers and signatures there are in your committed transaction

Transaction.Document(0).Signer(0).Signature(0).ID
Transaction.Document(0).Signer(0).Signature(0).URL 
Transaction.Document(0).Signer(0).Signature(0).AccessToken

Transaction.OpenTransaction
Transaction.Server
Transaction.ResponseProtocolVersion
Transaction.ServerUTCTime
Transaction.ServerLocalTime
Transaction.ServerLicenseVersion
Transaction.ServerSerial
Transaction.ServerType
Transaction.ServerLicensee
Transaction.ServerLicenseExpires
Transaction.PostedXml
Transaction.PostedXmlFormatted

Transaction.Debug.FormattedReturn