Sumsub — Travel Rule integration Travel Rule is an exchange of participant data between two VASPs about one transfer. Sumsub is the hub: you talk to Sumsub, Sumsub talks to the counterparty over whichever protocol you both speak. The integration is small. What makes it fail in production is that most integrations build one half of it — they start exchanges but never finalise them, or they answer the first question and not the second, and nothing in the API complains. This recipe is organised around those omissions. ⚠️ Sandbox tokens only Do not accept or use a production App Token here. Trave…