generated: '2026-07-18' method: searched source: https://docs.boxc.com/ model: shared-endpoint-test-flag detail: >- BoxC does not run a separate sandbox host. Production and test resources share the same endpoint, https://api.boxc.com/v1. Test mode is opted into per shipment via an immutable boolean flag rather than a distinct key or base URL. test_flag: field: test applies_to: shipment type: boolean default: false immutable: true effect: Generates test labels instead of live carrier labels for the shipment. retention: note: Test shipments and their labels older than 30 days are automatically purged. carrier_credentials_placeholder: note: >- Carrier credential examples in the docs use the literal placeholder value "TEST" for fields such as dp_api_key / dp_api_secret; these are documentation placeholders, not working credentials. notes: >- No test API keys, magic identifiers, or fixture/trigger tooling are published. The only documented sandbox mechanism is the per-shipment `test: true` flag against the production endpoint. Values captured verbatim from the docs; none invented.