Technical testing guides for payments, ledgers, and compliance flows
Eighteen technical guides give the requests, code, and data to test payment flows, ledgers, calculations, and compliance flows, from 3DS2 challenges and idempotency to camt.053 reconciliation, Nacha returns, interest accrual, and sanctions screening. Eight concept comparisons, such as PCI DSS vs SOC 2, show which option fits which conditions.
Guides
How to reconcile camt.053 statements: format, batch entries, reversals, and MT940 mapping
camt.053 format for reconciliation: balances, batch entries, reversal indicator, booking and value dates, MT940 field mapping, and a Python statement checker.
How to reduce false positives in sanctions screening: testing for false alerts and missed matches
Test sanctions screening with a labelled synthetic set in OFAC, EU, and UK list formats: precision and recall per threshold, date of birth rules, list update regression.
How to simulate chargebacks for disputes testing
Disputes testing: trigger chargebacks in processor sandboxes, replay pre-arbitration and second chargebacks in your harness, and check dispute fees in the ledger.
How to test 3DS2 challenge flows with 3DS test cards
Test EMV 3DS challenge flows with sandbox test cards: AReq, ARes, CReq, CRes, RReq, and RRes fields, browser and app channels, 3DS Method, and timeout windows.
How to test 90-day reauthentication, consent expiry, and token refresh in open banking
Test open banking reauthentication after the 90-day rule changed: EU 180-day SCA, UK 90-day reconfirmation, refresh token rotation, consent expiry, and clock skew.
How to test banker's rounding in payment and ledger code
How to test banker's rounding: exact half-way test vectors per ISO 4217 currency, float traps, language and SQL defaults, remainder splits, and the euro half-up rule.
How to test blockchain reorg handling for crypto deposit crediting
Test crypto deposit crediting under chain reorgs: regtest invalidateblock, Anvil anvil_reorg, replaced transactions, thresholds, and SQL checks for double credits.
How to test dunning: failed payment retries, decline codes, and subscription states
How to test dunning: decline-code retry decisions, Visa reattempt limits, account updater timing, past_due and unpaid states, dunning emails, and ledger effects.
How to test FX markup: rate application and markup disclosure
How to test FX markup: rate source and timestamp capture, rate lock and expiry, direct and inverse quotes, cross rates, and mark-up over the ECB reference rate.
How to test ledger reconciliation against settlement files and bank statements
Ledger reconciliation testing procedure: synthetic settlement files and camt.053 statements with injected breaks, SQL checks, business-day timing windows, tolerances.
How to test Nacha return codes: ACH return entries, time frames, and ledger effects
How to test Nacha return codes: synthetic return files with addenda type 99 records, R01 to R29 ledger effects, the 60-day window end date, and debit-only return rates.
How to test payment idempotency
How to test payment idempotency: replayed, altered, concurrent, and expired keys, timeouts after processor approval, and SQL checks for duplicate postings.
How to test prorated billing on upgrades, downgrades, and cancellations
How to test prorated billing: day and second bases, leap years, anchors on the 29th to 31st, time zones, credit lines, tax, rounding, and currency minor units.
How to test Same Day ACH cutoff times and settlement timing across time zones
Test Same Day ACH cutoff times: FedACH windows in Eastern Time, the 3:00 a.m. banking day, effective entry dates, Fed holidays, and US and EU clock changes.
How to test SCA exemptions: low value, TRA, and trusted beneficiaries
Test PSD2 SCA exemptions end to end: EMV 3DS exemption indicators, low-value counters, TRA fraud rates by value, trusted beneficiaries, and soft declines.
How to test the accrued interest formula and day count conventions
Test interest accrual against Actual/360, Actual/365 Fixed, Actual/Actual, and 30/360 variants: date matrix, decimal reference model, rounding point checks.
How to test webhook delivery from BaaS and payment providers
Webhook testing guide for BaaS and payment provider events: signatures, replay windows, retries, duplicates, out-of-order events, polling reconciliation, and tunnels.
How to use test card numbers in payment testing
Use test card numbers safely: Luhn check code, network prefixes and lengths, sandbox triggers for declines, CVC, AVS, expiry, and amounts, and a runnable decline matrix.
Comparisons
Contract testing vs end-to-end testing
Contract testing vs end-to-end testing for fintech integrations: partner bank and BaaS APIs, OpenAPI specs, webhook schemas, sandboxes, and money movement.
Dedicated team vs staff augmentation
Dedicated QA team or staff augmentation: who manages testers, who owns deliverables, where product knowledge stays, access control, and legal review.
In-house QA vs outsourced QA for fintech
In-house or outsourced QA for a fintech product: EU outsourcing and DORA obligations, test data location, payment rail knowledge, and who owns audit evidence.
Manual testing vs automated testing
Manual vs automated testing for fintech: what to automate (calculations, payment states, API contracts), what stays manual, and what drives cost and flakiness.
PCI DSS vs SOC 2 for fintech teams: who requires each, cardholder data environment or system description, ROC and AOC or SOC 2 report, and cadence.
Penetration testing vs vulnerability scanning
Penetration testing vs vulnerability scanning for payment systems: NIST SP 800-115 definitions, PCI DSS v4.0.1 and DORA frequencies, when to choose each, cost factors.
SOC 2 vs ISO 27001: a CPA firm's attestation report or an ISO/IEC 27001:2022 certificate, when fintech teams need each, and the test evidence both use.
Synthetic test data vs test data masking
Synthetic test data vs test data masking for fintech: GDPR status, PCI DSS 6.5.5, referential integrity, edge cases, re-identification risk, and ledger balances.
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