Payment flows & business logic
Checkout, transfers, invoices, and the decisions that connect a successful payment to a balance, an order, or a service.
Specialist exploitation risk assessments
Fintech security.
Beyond the pentest.
LSP Security assesses real-world exploitation risk in live fintech and payment systems. We investigate how weaknesses could affect money, accounts, and customer data, and establish the evidence behind that impact.
Discuss an assessment01 / Assessment focus
Security where
money moves.
For security and engineering teams at banks, fintech companies, online payment processors, and checkout providers. The assessment concentrates on the product logic and integrations that determine how money and data move.
Accounts, permissions & APIs
Who can access customer data, act on an account, or initiate a payment across users, merchants, and connected applications.
Payment integrations
Trust between your product and payment providers, including how payment outcomes are verified and translated into business actions.
02 / Expertise
Real systems.
Real consequences.
Our research has uncovered critical flaws that allowed money to be transferred from other users’ accounts without their credentials or approval. We’ve also found ways to access private customer data, alter other users’ invoices, and complete purchases for a fraction of the intended price.
Experience focused on impact
Years of bug bounty research have sharpened our ability to find vulnerabilities with real business consequences. We establish what a weakness makes possible and back it up with evidence.
Production testing only
Some payment flows only work fully in production. We test live applications and integrations with controlled accounts and transactions, investigating behavior that staging environments and routine test coverage can miss.
AI analysis. Human judgment.
We pair AI analysis with human expertise. Both shape the investigation, from questioning assumptions to verifying findings and explaining their business impact.
03 / Approach
Your priorities.
A clear outcome.
For teams tired of AI tools that overstate severity and pentest reports crowded with low-value findings, LSP focuses on real exploitation risk. We validate findings and tie severity to demonstrated business impact.
Choose what to test
Focus on one flow, a payment integration, or the whole product. Together, we define the systems, objectives, testing boundaries, and schedule.
Test the live behavior
Arrange controlled accounts and transactions with your team, then examine the business logic and security of the agreed production systems.
Get findings you can act on
Get a clear assessment report explaining each confirmed finding, its business impact, and practical remediation steps.
04 / Questions
Before
we begin.
How is this different from fintech penetration testing?
LSP focuses on the exploitation risk behind real financial activity. We investigate how business logic, permissions, and integrations combine in production, then validate the consequences of confirmed weaknesses. This can add a deeper, specialist assessment to an existing penetration testing program.
What does a fintech vulnerability assessment cover?
The agreed scope can include checkout and payment flows, account permissions, web applications, APIs, and connections to payment providers. The emphasis is on exploitability and business impact, with evidence and practical remediation guidance for confirmed findings.
Do you test only in production?
Yes. Some payment behavior only appears with live integrations and transactions. Before testing, we agree the systems, objectives, controlled accounts, transaction arrangements, and testing boundaries with your team.
05 / Contact
Something worth
a closer look?
Tell us about your product and the flow, integration, or wider scope you want assessed.
Email LSP