What is Payment Gateway Spoofing?

Payment gateway spoofing schemes cause users or merchants to hand off card data or funds to a fake page or maliciously modified integration. This includes look‑alike checkout iframes, scripts injected to skim PAN/CVV, DNS hijacks, or compromised SDKs calling home. The outcomes: credentials purloined, silent declines, disputes, and brand anguish.

Alarm bells: an inexplicable CVV mismatch due to a UI “update,” TLS or content‑security‑policy headers out of wack, a new script domain in prod, or a checkout UI layout that doesn’t match your last build. Attackers love third‑party tags and poor CI/CD hygiene.

Fixes: strict subresource integrity, CSP allowlists, key pinning where practical, tamper‑evident builds, and runtime monitors to disable unknown scripts. Tokenize end‑to‑end, keeping raw card data out of your app. If someone is caught in a suspect transaction or is first-time payout, tie people to identity verification and follow payment fraud prevention playbooks for evidence and edge throttles.

Assume the web page can lie. Verify what matters, on every deploy.