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One endpoint

All public requests use the same host and path prefix:
There is no separate sandbox hostname for v1. The API key selects the environment: Business workspaces have a live home tenant and a linked sandbox twin. After KYB approval you land in Live; Dev mode in the dashboard switches onto the twin. sk_test_… keys and sandbox webhooks belong to that twin. In Dev mode, partner rails are never called. Use Bank Simulator (General) to credit sandbox balances — emails, notifications, and webhooks still fire.

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Isolation

  • Webhooks and API keys are scoped to the active workspace (live or sandbox twin).
  • Responses include livemode / environment from the key you used.
  • Prefer sk_test_… while integrating; use sk_live_… only when you intend real money movement.
  • Individuals have no Dev toggle and no sandbox twin — they are always live.

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Webhooks

Register a webhook URL per environment. Live endpoints receive only live events; sandbox endpoints receive only sandbox events. Each environment has its own signing secret.