Hybrid phone app configuration

I am developing hybrid phone app. This app connects to an external application using url and all the rest  api urls are constructed by taking this url as base url.  I don't want to hard code the url in my app and I want the user should be able to provide the url and the app connects to that particular server. I am looking for something similar to outlook mobile app. Where user can specify the url of the company specific server and user name, password in configuration settings. I want to know how this feature can be implemented in mendix hybrid mobile app.  Any tutorial on this is helpful
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