Transaction Flows & Message Matching Quiz

Test your understanding of ISO8583 transaction flows, message matching, timeouts, and reversals.

Get every question correct to pass this checkpoint. You can review feedback, revise your answers, and submit again.

1. A request times out locally while the remote outcome is unknown. What should be persisted before recovery actions?

Select one answer.

A successful reversal status The original request identity and unresolved transaction state Only a new STAN, discarding the original A settled status

2. Two network profiles use different response-matching keys. How should a gateway choose the key?

Select one answer.

Use the configured matching strategy for the route Infer it from which response arrives first Always use the PAN alone Always use DE11 alone

3. What can be inferred from a reversal request or advice being sent?

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All networks use identical reversal semantics An advice cannot be rejected or lost A recovery message was sent; completion still needs the configured evidence The original debit is certainly gone

4. You're building a reversal (0400) for an original authorization. Which statement about DE90 (Original Data Elements) is correct?

Select one answer.

DE90 should be built from the 0110 response fields DE90 should be built from the original 0100 request fields DE90 is optional and only used for partial reversals DE90 contains the STAN from the reversal itself

5. A reversal receives a non-success response. Is that sufficient to prove the original transaction already settled?

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Yes, any reversal error means settlement No; investigate the profile-defined code and correlated state Yes, that is the only possible cause No, it proves the original never existed

6. What is the purpose of Network Management message 0800 with DE70='301'?

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Sign-on to the network Key exchange request Echo test (keep-alive) End-of-day cutover

7. Under the course MTI decomposition, what class does 0120 belong to?

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Authorization advice Financial advice Network-management response Reversal request

8. An approval arrives after a local timeout and after a reversal was sent, but before reversal confirmation. What is the robust state transition?

Select one answer.

Erase the approval and mark the reversal successful Record the approval and continue reconciliation without duplicating business effects Treat the timeout as proof the approval is invalid Create a fresh charge immediately

9. Which reversal fields should receive fresh values rather than copied values?

Select one answer.

Every field including original transaction identity DE11 and DE7 universally, under every profile Those specified by the selected profile; retain original identifiers for linkage None under any profile

10. Three reversal attempts time out. What justifies a next action?

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Assuming three timeouts means success A bounded recovery policy defining escalation, advice, or reconciliation Retrying indefinitely without persisted state A universal rule requiring 0420 after exactly three attempts

11. A six-digit STAN is unique only within a terminal/day window. What happens if responses can arrive outside that window?

Select one answer.

Uniqueness automatically extends forever Matching needs additional context or a retention/collision policy The bitmap detects the collision A MAC supplies the missing business identity

12. A course partial-reversal policy encodes the released amount. A hold is 120 and final capture is 95. With two decimal places, what DE4 is released?

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000000009500 000000002500 000000021500 000000012000

13. In this MTI convention, what relationship does 0121 have to 0120?

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It confirms settlement It changes the class to reversal It proves a new financial charge It is a repeat of an authorization advice

14. A Visa transaction uses DE11 + DE7 for matching, while a local network uses DE11 + DE41. How should a payment gateway handle this?

Select one answer.

Only match on DE11 since that's common to both Use a configurable MatchingStrategy based on the network routing Always use the strictest matching (all fields) Require all networks to use the same matching rules

15. Two approvals share STAN, time, amount, and PAN but have different RRNs. What is the correct diagnostic conclusion?

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Two purchases are impossible Different RRNs prove independent customer intent There is an apparent duplicate requiring correlation evidence; these fields do not prove a specific bug A STAN-generator race is proved

16. An authorization-advice acknowledgment is delivered twice for the same operation. What must the processor preserve?

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One application of business effects with recorded duplicate handling A second effect for the second delivery A universal assumption that advice equals settlement A fresh business identity for the duplicate

17. A late reversal response reports a profile-defined transient failure. What should the state machine avoid?

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Persisting the failed response Escalating unresolved state Marking the reversal successful without confirming evidence Using a bounded retry policy

18. A route requires DE11 and DE7 for correlation. A response has DE11 and DE37 but lacks DE7. What should happen?

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Match the first pending request Assume DE7 is current time Treat it as unmatchable under that configured key Silently substitute DE37

19. A store-and-forward policy has an eight-hour maximum age; an unsent advice is thirteen hours old. What is the justified action?

Select one answer.

Change its original timestamp to make it fresh Expire/escalate it according to policy and retain its unresolved outcome Send forever because advice never expires Mark it successfully processed

20. A recovery policy escalates a reversal request to advice after a retry limit. What identity information must survive?

Select one answer.

Only the response code Only the newest transport socket The linkage to the original operation and its recorded recovery state Only a random new PAN

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