How API Webhook Retries Cause Duplicate Payments

What this episode covers

Episode 54 of The Developer Tools Podcast explores how webhook retries in payment APIs can trigger duplicate charges — and why standard at-least-once delivery guarantees are often the culprit. Lucas and Luna break down a real-world case from a mid-size e-commerce platform that lost $40,000 in two hours due to missing idempotency checks on webhook receivers. They discuss how idempotency keys, exactly-once semantics, and receiver-side deduplication can prevent these failures. Listeners will learn the difference between webhook retries and API idempotency, how Stripe and PayPal handle delivery guarantees, and why your payment integration needs a dedup table before it goes to production. #WebhookRetries #DuplicatePayments #PaymentAPIs #IdempotencyKeys #ExactlyOnceDelivery #Deduplication #StripeAPI #PayPalAPI #Ecommerce #DeveloperExperience #APIReliability #Business #Technology #FexingoBusiness #BusinessPodcast #DeveloperTools #Infrastructure #SoftwareEngineering Keep every episode free: buymeacoffee.com/fexingo

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Frequently Asked Questions

How long is this episode of The Developer Tools Podcast with Fexingo: APIs, Infrastructure, and Software for Engineers?

This episode is 9 minutes long.

When was this The Developer Tools Podcast with Fexingo: APIs, Infrastructure, and Software for Engineers episode published?

This episode was published on June 16, 2026.

What is this episode about?

Episode 54 of The Developer Tools Podcast explores how webhook retries in payment APIs can trigger duplicate charges — and why standard at-least-once delivery guarantees are often the culprit. Lucas and Luna break down a real-world case from a...

Can I download this The Developer Tools Podcast with Fexingo: APIs, Infrastructure, and Software for Engineers episode?

Yes, you can download this episode by clicking the download button on the episode player, or subscribe to the podcast in your preferred podcast app for automatic downloads.