Third-party APIs (Silae, PayFit, Lucca): where to look at integration security
> TL;DR: Payroll integrations often create their own exposure surface: secrets, webhooks, identity mapping, and logs.
The risk is not only in the core product
sensitive data integrations add a specific surface: API keys, webhooks, identity mapping, sync jobs, silent failures, and logs.
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Frequent blind spots
For software vendors
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Key Takeaways
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Related articles
Three adjacent analyses to keep exploring the same attack surface.
Webhooks between your services: signature, replay, and data in transit
Webhooks moving data between your services carry sensitive amounts. What to actually verify.
User enumeration: how your API reveals who your customers are
Differentiated error messages, sequential IDs, endpoints without rate limiting: your API may allow listing your customers and their users. Why it matters for a SaaS product, and how to fix it.
API and webhook vulnerabilities: the 2026 guide to the mistakes that really expose data
Reference guide to the API and webhook mistakes that create real exposure: BOLA, mass assignment, sensitive business flows, HMAC signatures, overly verbose docs, and over-trusting callbacks.
Sources
Editorial analysis based on official vendor, project, and regulator documentation.
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