November 10, 2026

AI / FINTECH / CRYPTO / TECH

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Stories: Security

Comparison of payment webhook signatures: Stripe signs a timestamp and the raw body with HMAC-SHA256, Adyen signs eight colon-joined fields with HMAC-SHA256 and no timestamp, and PayPal signs the transmission ID, time, webhook ID and a CRC32 of the body with SHA256withRSA.

Payment APIs · Oct 5

Verifying Payment Webhook Signatures at Stripe, Adyen and PayPal

Stripe, Adyen and PayPal all sign webhooks, but not the same things. What each check proves and where it breaks.

A hand above a payment approval switch, connected through a green gate beside an invoice.

AI agents · Sep 26

Before an AI Agent Makes a Payment: Permissions, Limits and Approval

An agent can prepare a payment. Separate controls must decide whether it is allowed to send it.