I really wanted Slack notifications for when a merchant installed, subscribed or uninstalled my app.
But I just really did not want to code it by hand.
So I built a Pipedream workflow & Shopify Partner integration that you can use to integrate your Slack workspace to get these neat real time events.
You can copy the workflow for yourself and follow the integration instructions here, no developer required:
https://dylanjpierce.com/blog/2022/02/24/shopify-partner-installs-to-slack-no-code.html