The Payment Services Directive 2 (PSD2) introduced not only requirements for security and compliance in financial systems but also expectations for high performance and uninterrupted service.
Open banking APIs must consistently deliver fast and reliable responses to third-party providers (TPPs), as API latency directly affects customer experience.
Therefore, performance and resilience testing have become one of the most critical components of PSD2 compliance.

Why Are Performance and Resilience Tests Critical?

EBA Expectations:
The European Banking Authority (EBA) requires banks to ensure uninterrupted access for TPPs to open banking APIs.

Local Regulators:
In Turkey, the BRSA (BDDK); in Germany, BaFin; and in the UK, the FCA, all mandate regular performance reporting and capacity planning.

Customer Trust:
A decline in API performance causes delays in payment and transaction processes, leading directly to customer loss.

Regulatory Compliance:
Under PSD2, APIs are expected to deliver services in accordance with SLA (Service Level Agreement) requirements.

Key Focus Areas in Testing

⚡ Load Testing

  • Measuring API response times under thousands of simultaneous TPP requests.
  • Assessing system behavior under normal and peak loads (such as salary days, campaigns, or year-end).

🛡️ Resilience Testing

  • Evaluating system stability during exceptional scenarios such as server failures or database outages.
  • Testing disaster recovery (DR) and failover procedures.

🌍 End-to-End Transaction Performance

  • Measuring total processing times for payment initiation, balance inquiries, and fund transfers.
  • Validating API consistency across multi-bank transaction flows.

🚨 Stress Testing

  • Pushing the system to its operational limits.
  • Identifying slowdown or failure thresholds to strengthen capacity planning.

Common Challenges

Multiple Stakeholders:
APIs must satisfy differing performance expectations among TPPs, banks, and regulators.

Sudden Load Spikes:
Campaign periods or high transaction seasons can cause unexpected capacity issues.

Realistic Scenario Modeling:
Generating traffic models that accurately simulate real-world usage remains complex.

Regulatory Variations:
Beyond EBA guidelines, local regulators such as BDDK, BaFin, and FCA require distinct reporting formats and metrics.

Virgosol’s Contribution

Virgosol delivers advanced solutions for performance and resilience testing through industry-leading tools and methodologies:

✅ Load and Stress Testing:
Realistic traffic modeling and high-volume simulations powered by the Loadmance platform.

✅ Resilience Simulations:
Testing for exceptional events such as server crashes or network interruptions.

✅ API Performance Reporting:
Comprehensive reports aligned with EBA, BDDK, BaFin, and FCA compliance requirements.

✅ CI/CD Integration:
Continuous integration of performance testing into development pipelines via QAmaster.

Within the PSD2 framework, performance and resilience testing safeguard not only regulatory compliance but also customer satisfaction and business continuity.
For financial institutions, ensuring transaction durability and preparedness for exceptional conditions creates a powerful competitive advantage.

At Virgosol, we deliver end-to-end performance testing services — from load and stress testing to disaster recovery simulations — enabling the financial sector to build robust, compliant, and future-ready systems.