Financial Services
PCI-Compliant APIs Without the Complexity
Payment data in API responses is a compliance landmine. RequestRocket enforces access controls and strips sensitive fields before they ever reach an unauthorised caller.
The Challenge
Payment APIs Return More Data Than Any Consumer Should See
A fintech platform connecting to payment processors, core banking APIs, and card networks faced a recurring problem: the upstream APIs returned full response payloads including PANs, CVVs, account numbers, and sort codes. Not every internal service or partner integration was authorised to see that data — but the API couldn't be changed.
Unredacted PAN and CVV in Responses
Payment API responses included full card numbers and security codes that internal analytics services had no business reason to process.
No Per-Consumer Access Control
All consumers of the internal payment API shared the same upstream credential, with no way to restrict individual callers by path or method.
Audit Trail Gaps
When an incident required tracing which system made a specific payment API call and what data it received, the logs didn't exist.
Policy Changes Required Code Deployments
Every time a new access rule was needed, engineers had to update middleware, test, and redeploy — a weeks-long process.
The Solution
Intercept, Filter, and Enforce — Without Touching the Upstream
The team placed RequestRocket between all internal consumers and the payment APIs. Response filters strip PAN, CVV, and account number fields from every response routed to non-authorised callers. Authorization rules restrict each service credential to only the payment API paths it is permitted to call. All requests are logged with credential identity and response metadata.
How it works
- 1
Create a RequestRocket target pointing at each upstream payment API and define a proxy for each logical access pattern (read-only, full access, partner access).
- 2
Add response filters using JSON path rules to redact PAN, CVV, sort codes, and account numbers from response payloads routed to non-PCI-scoped credentials.
- 3
Issue per-service RequestRocket credentials and bind each to the appropriate proxy with allow-list authorization rules covering permitted HTTP methods and path patterns.
- 4
Configure rate limits to prevent any single service from overwhelming the upstream payment provider.
- 5
Enable observability streaming to the company's SIEM so every payment API call is part of the audit trail, with credential identity, path, status, and redaction flags.
The Results
Measurable Impact
PAN and CVV redacted from all non-authorised responses
Response filters run on every proxied call. Analytics, reporting, and partner systems receive payment API responses with sensitive card fields removed before the payload ever leaves RequestRocket.
Full per-service audit trail in place
Every payment API call is captured with the calling credential identity, endpoint path, HTTP status, latency, and whether any redaction filters were applied.
Access policy changes deployed in minutes
New authorization rules are applied in the RequestRocket control plane and take effect immediately — no code changes, no redeployments, no change management delays.
Zero cross-service access violations
Since deploying per-credential authorization rules, no service has successfully called a payment API endpoint outside its permitted scope — confirmed by continuous log review.
FAQ
Frequently Asked Questions
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