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Transaction lab

A card, a terminal, an acquirer and an issuer, and a real ISO 8583 message passing between them. Change any field, switch any of the issuer's checks off, and watch which one was doing the work. Everything runs in your browser; nothing here touches a real network.

Part of the payment systems course

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The lab is course material rather than a tool. It is the last third of the curriculum made interactive, and it assumes you have read enough to know why an amount appearing twice matters. It comes with an enrollment.

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The workbench and the APDU decoder stay free and need no account.