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Reverse-engineering the Telebirr receipt QR code

A customer holds up their phone at a shop counter in Addis. On the screen is a Telebirr receipt, and in the corner is a small square labelled Payment QR Code .

  • Telebirr receipt QR code decoded from base64 to ASCII hex characters
  • Transaction number hidden within larger hex value in TLV format
  • Python script used to decode QR code and validate transaction number and CRC

Don't write the prompt. Get interviewed

Everyone teaches you to write prompts. In practice, a person looks at a sample a couple of pages long, with a stack, constraints, formats and edge cases, and closes the tab: there's no way I'll write…

  • Instead of writing prompts, conduct an interview with the agent.
  • Ask targeted questions about system behavior and decision limits.
  • Use interview insights to construct the final prompt.

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