Settings
Open For developers → your application → Settings.
The screenshots show a demo application with fictional data.
Keys
Settings displays the Client ID and Secret key. You can copy them and reveal the hidden key. These fields are read-only. Keep the secret on the application server; do not put it in browser JavaScript, screenshots or public examples.
Application URL
Enter the application address in the field named for its type: URL Widget, Url iFrame or Plugin URL.

Development mode
To use Development mode, enable it and fill in the development URL that appears. Check which mode is saved before testing launch.

The development URL is used when launching a widget or embedded page only if all conditions hold: development mode is enabled, a development URL is set, and the current project's internal ID matches the application owner's ID or one of its administrators' IDs. Other projects use the main application URL.
The check uses the project ID, not just the signed-in account. Even an application owner who switches to another project may open the main URL. When testing, compare the launch project_id with the owner's or administrator's project. Save changes to the mode and URL first.
OAuth redirect URL
Add up to five allowed return addresses in OAuth redirect URL. Use Add for another row and the trash button to remove an extra row; the final row remains in the form. The OAuth request's redirect_uri must exactly match a configured URL, including the scheme, path and trailing / when present. Save the URLs and mode with Save.
The server rejects saving more than five addresses. Keep the required URLs, save again and use the selected redirect_uri in the OAuth example.