You can find the API endpoint for your Ragic Builder form or entry by passing api as a query string parameter to specify this is an API request.
Please note that you're using the version 3 API by adding a version parameter v=3. It's a good practice to specify the API version every time you send your request to ensure a correct version. If the version is not specified, the latest version will be used, but unexpected changes to the API may cause problems in your application.
For example if you usually access your Ragic Builder form using the following URL:
Its HTTP API endpoint URL would be:
Or for a single entry in your form, you would include an id to specify an entry:
Its corresponding HTTP API endpoint URL is simply: