Hi there,
Thanks so much for getting in touch and for the question.
I have added this functionality now to the latest updated version of the plugin. Could I kindly ask you to install the latest version, and then you should see the new option under settings called ‘Require Authentication for REST API Requests’. Enable this setting and then save the settings. The setting is under Zephyr > Settings > General Settings (https://ibb.co/3cjkZWb).
Then you can go to your profile page in WordPress and edit your user details, and create an ‘Application Password’. Once created, you can use this to authenticate your requests using the Basic Authorization method.
So essentially, in the request, send the ‘Basic <username>:<password>’ header, where the username is your WordPress username and the password is the application password you used.
When making the request now, you should see the successful data, otherwise it will show an error saying that the password is incorrect or required.
I hope this helps. If you have any questions at all or if there is anyway I can help, please do let me know and I would be more than happy to help!
Kindest regards,
Dylan