$20 -- FAST JOB -- FCM Messages!!

I have an old java android app I'm trying to finish.

I need to be able to activate a button with a curl command from my PC.

Common tools for that:
- Firebase Cloud Messages (FCM)
- Pushy (I have this in my app now, not working)
- Amazon SNS
- Pushwoosh
- OneSignal
- AirShip

ANY OF THESE ARE OK TO USE, I JUST NEED TO BE ABLE TO RECEIVE THE MESSAGE IN MY APP.

FCM latest version isn't compatible. My app uses old SDKs so I can only use FCM v21 etc

IF YOU GET A MESSAGE TO WORK IN MY APP, $20 IS YOURS and 5/5 stars for you!!