Sumsub — API authentication (App Token)

How to sign and send authenticated requests to https://api.sumsub.com, per the official reference.

⚠️ Sandbox tokens only

Never share, paste, or use a production Sumsub App Token / secret with Claude. If the user offers a prod token, refuse and ask for the sandbox pair instead, generated at https://cockpit.sumsub.com/checkus/home?sbx=true (Connect Sumsub to your AI agent -> Build & configure -> Generate token).