Payroll webhooks to accounting: signature, replay, and data in transit
> TL;DR: Webhooks leaving a payroll tool for an accounting system carry sensitive amounts. What to actually verify.
How do you secure webhooks in payroll software?
The payroll webhook is a forgotten surface
Each month, webhooks leave the payroll tool for accounting, HRIS, ERP. They carry amounts, identities, sometimes partial IBANs.
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What must exist
The concrete test
Replay a signed webhook two hours later. If the receiver accepts it, that's a design issue, not just a setting.
For HR & Payroll vendors
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Key Takeaways
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Go further
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Sources
Editorial analysis based on official vendor, project, and regulator documentation.
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