How to test mobile application which has to interact with a web based application

Currently, in my project, I have to create requests from a web-based application.
Those requests are sent to the mobile application for approval or rejection. How will I test both as in I have to create the request from a web application (not using the mobile browser) from a desktop browser and those created request should be approved or rejected from the mobile application?

Is it possible to call scripts recorded for web application during the execution of mobile application?