I am developing a ionic mobile app in which i want to redirect to a thirdparty webflow which requests users\' consent and redirects to the callback url which i should specif
It sounds that you will need to handle popup and redirects, you will need to install the cordova "inappbrowser" plugin in order to be able to open the thrid party webflow inside the app browser and then go back to normal.
Please take a look at this article in where they are explaining how to deal with facebook authentification using the firebase login methods with Ionic and cordova. It describes very similar steps that you will need to tackle your problem.
Firebase simple login with Ionic and Cordova
If you are in a rush start from "Getting It Working in the Emulator" but I recommend reading all the article quickly.
I am not sure which kind of third party webflow are you using, but maybe this could help you: Zapier