Attackers follow the money. We test payment flows, banking and lending apps, APIs and cardholder environments by hand, with PCI DSS v4.0 11.4 testing, segmentation checks and a free retest.
Manual testing of payments, transfers, refunds and balances for race conditions, tampering, IDOR and logic flaws that automated scanners can't find.
Authentication, authorization and abuse testing of public and partner APIs, open banking integrations and mobile app backends.
Internal, external and segmentation testing for PCI DSS v4.0 Requirement 11.4, with the scope, methodology and evidence your QSA expects.
Book a free scoping call. Tell us about your platform and QSA deadline, and you'll get a clear fixed-price proposal.
Copyright © 2026 Zero Day Security - All Rights Reserved.
CREST CRT, OSCP, OSWA, OSWP, HTB COAE certified