Fintech Security & Visa Compliance
Implementation of critical security updates and new Visa policies for a fintech platform.
- C#
- .NET
- Payment Gateways
The Challenge
In the fintech sector, regulatory changes can be an existential threat if not implemented on time. Visa announced sweeping changes to their security and processing protocols for credit card transactions. These had to be integrated into the existing live system without jeopardizing ongoing payment traffic (millions in volume). Failure would have led to the immediate revocation of the processing license and massive financial losses.
The Solution
As the responsible Backend Engineer, I took over the technical analysis and implementation of these critical updates.
Steps to Compliance
- Gap Analysis: Detailed review of the new Visa "Technical Specifications" against the existing codebase.
- Logic Refactoring: Adapting transaction logic in C#/.NET to correctly process new validation codes and response schemas from credit card networks.
- Testing: Implementation of extensive integration tests with mocking services to simulate all possible Visa response scenarios before code went to production.
The Result
The system passed the external security audit without any objections. The new policies were pushed live by the deadline, ensuring uninterrupted payment processing for all customers.