My requirement is to create an app that can be installed on multiple merchants and their stores. I need to write the API_KEY and SECRET_KEY in the .env file for the reactJS project. The problem is that I can keep only one merchant's API_KEY and SECRET_KEY in the .env file.
So how should I handle the app authentication so that the app can be installed for any merchants store in such a situation?
Kindly suggest any proper solution for the above requirement.