While using push notifications, the additional channels and interfaces configuration prompts for the mobile app name and certificates. I am using Pega 7.4 So is there any possibility to download the certificate for this version. How does this push notification smart shape work?
I am not quite sure about the certificates but to answer the other part of your question i.e how does the push notification works below are the links that can be followed to understand and configure the push notification
This push notification allows you to push the message to the Pega mobile channel, that’s why you need to have the mobile channel defined. Mobile channel contains push configuration for both, iOS and Android platform - the first one requires push certificate, second one requires only some Keys generated on GCM/FCM service, this configuration allows Pega engine to send push to particular app. This is required to use Push Notification shape.