When logged in, follow the next steps:
- Go to the Apps page and click on the “+ Create new App” link.
- In the respective form, fill in the title, a description and a redirect URI for the oAuth flow and click "Submit".
- In the next page, save the Client ID and Client Secret. The Client ID can be seen at any given time. On the contrary the Client Secret is only visible upon registration, so make sure you keep it stored. Otherwise, you will have to reset it and take note of the new value. At this point, the application is registered and you can browse and subscribe to the available APIs, through specific product plans.
For further information, read the chapter “First Steps” in the section “Getting Started” (here).