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A 200 from a Stripe payment link does not mean the link exists

it followed six real links, and then one slug made of twenty-three zeros: URL followed status body bytes body…

  • Stripe payment link's 200 status code doesn't confirm its existence.
  • Release verifier found a non-existent 23-digit zero slug.
  • Use Stripe API to resolve links, not HTTP fetches.

The "Press-It-Twice" Problem: Why Idempotency is Your API's Best Friend

What is Idempotency? Idempotency is a core design property of software systems where performing an operation multiple times produces the exact same result as running it once.

  • Idempotency ensures repeated operations yield same result as single execution
  • Elevator button metaphor illustrates idempotent action vs non-idempotent purchase
  • Idempotency keys help servers identify and return cached responses for duplicate requests

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