U-PAI: A Universal Payment Application Interface
description
Transcript of U-PAI: A Universal Payment Application Interface
![Page 1: U-PAI: A Universal Payment Application Interface](https://reader033.fdocuments.net/reader033/viewer/2022051623/56815863550346895dc5c083/html5/thumbnails/1.jpg)
U-PAI: A Universal Payment Application Interface
A paper from Second USENIX Workshop on Electronic Commerce,
USENIX, Oakland, CA
![Page 2: U-PAI: A Universal Payment Application Interface](https://reader033.fdocuments.net/reader033/viewer/2022051623/56815863550346895dc5c083/html5/thumbnails/2.jpg)
March 21, 2000 presented by steve 2
Outline
Introduction API Definitions Sample Ecash Proxy Conclusions
![Page 3: U-PAI: A Universal Payment Application Interface](https://reader033.fdocuments.net/reader033/viewer/2022051623/56815863550346895dc5c083/html5/thumbnails/3.jpg)
March 21, 2000 presented by steve 3
Introduction
Many payment mechanisms nowadayse.g. First Virtual, CyberCash, Ecash, SET,…
The most significant difference is the order of steps required to execute a payment
![Page 4: U-PAI: A Universal Payment Application Interface](https://reader033.fdocuments.net/reader033/viewer/2022051623/56815863550346895dc5c083/html5/thumbnails/4.jpg)
March 21, 2000 presented by steve 4
Introduction (2)
Diversity of payment mechanisms stymied the progress of electronic commercecustomers must maintain accounts with
several different payment mechanismsno standard way for payment mechanisms to
interact with application software
![Page 5: U-PAI: A Universal Payment Application Interface](https://reader033.fdocuments.net/reader033/viewer/2022051623/56815863550346895dc5c083/html5/thumbnails/5.jpg)
March 21, 2000 presented by steve 5
U-PAI
U-PAI, a universal payment application interfaceGoal: define a common set of functions that
act as a layer of abstraction between application software and payment mechanisms
![Page 6: U-PAI: A Universal Payment Application Interface](https://reader033.fdocuments.net/reader033/viewer/2022051623/56815863550346895dc5c083/html5/thumbnails/6.jpg)
March 21, 2000 presented by steve 6
U-PAI abstracts payment mechanism internals
![Page 7: U-PAI: A Universal Payment Application Interface](https://reader033.fdocuments.net/reader033/viewer/2022051623/56815863550346895dc5c083/html5/thumbnails/7.jpg)
March 21, 2000 presented by steve 7
API Definitions
CORBA specification in ISL of Xerox PARCs ILU
Three main objects:AccountHandlePCR (Payment Control Record)Monitor
![Page 8: U-PAI: A Universal Payment Application Interface](https://reader033.fdocuments.net/reader033/viewer/2022051623/56815863550346895dc5c083/html5/thumbnails/8.jpg)
March 21, 2000 presented by steve 8
AccountHandle
This instance is a representation of a real-world account
The user wishes to start making electronic payments with the account
Query balance and credit limits on the account
![Page 9: U-PAI: A Universal Payment Application Interface](https://reader033.fdocuments.net/reader033/viewer/2022051623/56815863550346895dc5c083/html5/thumbnails/9.jpg)
March 21, 2000 presented by steve 9
Analogy to clarify the notion of accounts and AccountHandle
![Page 10: U-PAI: A Universal Payment Application Interface](https://reader033.fdocuments.net/reader033/viewer/2022051623/56815863550346895dc5c083/html5/thumbnails/10.jpg)
March 21, 2000 presented by steve 10
AccountHandle (2)
Internal fields:BalanceCreditLimitAccountTypeTransferAccountTypesFromTransferAccountTypesTo…
![Page 11: U-PAI: A Universal Payment Application Interface](https://reader033.fdocuments.net/reader033/viewer/2022051623/56815863550346895dc5c083/html5/thumbnails/11.jpg)
March 21, 2000 presented by steve 11
AccountHandle (3)
Methods:OpenAccount(PropertySet acctinfo): AnyCreateAccount(PropertySet acctinfo): AnyCloseAccount()DeleteAccount()
![Page 12: U-PAI: A Universal Payment Application Interface](https://reader033.fdocuments.net/reader033/viewer/2022051623/56815863550346895dc5c083/html5/thumbnails/12.jpg)
March 21, 2000 presented by steve 12
PCR (Payment Control Record)
This instance is a representation of a single payment transaction
the locus of control for all activities regarding that payment
![Page 13: U-PAI: A Universal Payment Application Interface](https://reader033.fdocuments.net/reader033/viewer/2022051623/56815863550346895dc5c083/html5/thumbnails/13.jpg)
March 21, 2000 presented by steve 13
PCR (2)
Internal fields:RefID, ContextIDAmountDestAccountHandle, SourceAccountHandleStatusMonitorList…
![Page 14: U-PAI: A Universal Payment Application Interface](https://reader033.fdocuments.net/reader033/viewer/2022051623/56815863550346895dc5c083/html5/thumbnails/14.jpg)
March 21, 2000 presented by steve 14
PCR (3)
Methods:StartTransfer()TryToAbortTransfer()UpdateStatus(StatusEntry stat)
![Page 15: U-PAI: A Universal Payment Application Interface](https://reader033.fdocuments.net/reader033/viewer/2022051623/56815863550346895dc5c083/html5/thumbnails/15.jpg)
March 21, 2000 presented by steve 15
Monitor
To supplement the status tracking feature of a PCR
Internal field: status Method: Notify(PCR p, StatusEntry s)
![Page 16: U-PAI: A Universal Payment Application Interface](https://reader033.fdocuments.net/reader033/viewer/2022051623/56815863550346895dc5c083/html5/thumbnails/16.jpg)
March 21, 2000 presented by steve 20
Sample Ecash Proxy
An electronic “coin”-based payment mechanism
Provides anonymity for the purchaser U-PAI interacts with ecash at the level of
the user operations
![Page 17: U-PAI: A Universal Payment Application Interface](https://reader033.fdocuments.net/reader033/viewer/2022051623/56815863550346895dc5c083/html5/thumbnails/17.jpg)
March 21, 2000 presented by steve 21
Ecash
E-cash/UNIX Pay Command
Coins transferred by e-cash
Payment Complete?
Accept deposit? (E-cash protocol)
Yes
Coins transferred by e-cash
Merchant Application
Customer Application
Merchant E-cash ClientBank
E-cash Server
Customer E-cash Client
![Page 18: U-PAI: A Universal Payment Application Interface](https://reader033.fdocuments.net/reader033/viewer/2022051623/56815863550346895dc5c083/html5/thumbnails/18.jpg)
March 21, 2000 presented by steve 22
(c) Update Status(c) Update Status
(d) Notify(d) Notify(a) StartTransfer
(b) StartTransfer
Request and send Host/Port Info
Merchant E-cash Client
Merchant E-cash AccountHandle
Payment Control Record
Merchant Monitor
Customer Monitor
Application
Customer E-cash AccountHandle
Customer E-cash Client Bank
E-cash Server
![Page 19: U-PAI: A Universal Payment Application Interface](https://reader033.fdocuments.net/reader033/viewer/2022051623/56815863550346895dc5c083/html5/thumbnails/19.jpg)
March 21, 2000 presented by steve 23
Conclusions
U-PAI allows a variety of payment mechanisms to be accessed by the same interface
U-PAI only covers the basic functionality of accounts and payments
![Page 20: U-PAI: A Universal Payment Application Interface](https://reader033.fdocuments.net/reader033/viewer/2022051623/56815863550346895dc5c083/html5/thumbnails/20.jpg)
March 21, 2000 presented by steve 24
![Page 21: U-PAI: A Universal Payment Application Interface](https://reader033.fdocuments.net/reader033/viewer/2022051623/56815863550346895dc5c083/html5/thumbnails/21.jpg)
March 21, 2000 presented by steve 25
![Page 22: U-PAI: A Universal Payment Application Interface](https://reader033.fdocuments.net/reader033/viewer/2022051623/56815863550346895dc5c083/html5/thumbnails/22.jpg)
March 21, 2000 presented by steve 26
![Page 23: U-PAI: A Universal Payment Application Interface](https://reader033.fdocuments.net/reader033/viewer/2022051623/56815863550346895dc5c083/html5/thumbnails/23.jpg)
The EndThe End