F5 APM Integration with Forti-Authenticator Mobile Push

Hello,

After initial logon page FortiAuthenticator sends back a RADIUS Access-Challenge and includes this message:
'+Please enter the token code. You can also submit a blank response to initiate a push notification to your FortiToken Mobile app.'

In Fortiauthenticator in order to push login request to a mobile device the client must type 'push' in the token field and submit this, to have FortiAuthenticator trigger a push notification. Fortiauthenticator should receive this response via API call to 'https://IP address/api/v1/pushauthresp/'.  I think I have to insert an object between logon page and Radius authentication object to respond with 'push' for every request.

Flow: Client ---> APM ---> Fortiauthenticator

Can someone guide me how I can deal with this case ?

Thanks