Access 'code' in the in-client app.

We are going to build one app in zoom marketplace which will run in-client app when meeting is going on. our app is developed in reactjs(frontend) and python (backend) and llm model (AWS) which detect the deepfake detection. now we don’t have any authorization in our app, we are going to use zoom app oAuth for same.

so current flow is like that, when user install our app, it redirect to oauth URL which we have mentioned frontend url and it send ‘code’ param and its value. now this all process happnes in the browser either chrome or firefox now we wanted this ‘code’ value in our app, it means that ‘in-client’ app, so from the app we can send this code to backend using api and they can generate access and refresh token based on the code received.

Currently problem is like that, code generated but it all in chrome (external browser) while we are calling API of backend from our in-client app. so how can we fix this issue or what workflow should to follow?