Take a look at the 2 main components that will guide you to $PUSH nodes & their mechanism:
EPNS Core – Smart contract that will reside on $ETH
EPNS Communicator – Smart contract that will reside on ETH, Polygon, #BSC , etc Read more about it here
https://medium.com/ethereum-push-notification-service/roadmap-q3-audited-epns-push-protocol-v1-is-here-f4560dfe550c
