I am trying to implement atom payment gateway in my Flutter app (Android), but unfortunately atom doesn't provide an SDK for Flutter. How can I implement it in Flutter. Is it possible to achieve using method channelling?
Yes you can use method channels to call platform-specific methods from flutter.
I've had a similar situation when I had to use paytabs SDK for iOS and Android. I've used method channels to channel the parameters to the sdks on the platforms. It's working very well actually.
I don't know about ATOM but you can take a look at the SDK I made for flutter here. It's just a working example to start from.