https://access.redhat.com/documentation/en-us/red_hat_3scale_api_management/2.7/html/getting_started/getting-started#securing-api-prototype

4. After verification, enter the private base URL. Example: https://echo-api.3scale.net:443

The private base URL has been set in API Backend by default.

5. To make a test call, enter the URL path for a valid GET request; example: /v1/fast/track, and then click Update & Test Staging Environment.

Update & Test Staging Environment is replaced with Promote button.