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Sandbox keys (sk_sandbox_) place real calls, but under guardrails designed for safe testing.

Trial window

The sandbox trial clock starts on your first API call and runs for 30 minutes. After it expires, callback requests return 403 with error_code: SANDBOX_EXPIRED. The dashboard shows a live countdown.

Destination lock

To prevent abuse, sandbox calls can only ring the org owner’s signup phone number — the number verified at sign-up. A callback to any other to returns 403 with error_code: SANDBOX_DESTINATION_NOT_ALLOWED. Calling arbitrary destinations requires the production upgrade (coming soon).

Test numbers & simulated errors

Force specific outcomes without depending on a live call, in two ways. The header wins if both apply. Reserved test number The x-wave-simulate header Set x-wave-simulate on POST /v1/callback to force an error variant (sandbox keys only — production ignores it):

Limits

Sandbox keys are rate-limited — see Rate limits.