How does automatic setup work for apps in Shopify admin?

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How do an app automatically gets setup on just installing it into the Shopify admin account?
for example i recently installed shiprocket app and it ask me to first create an account on it and to setup ... and on the other hand i installed judge.me and on just installing it, it setups automatically and didn't asked me to setup or create any account.
So how this happened and what is the technical aspect to do this that if user installs my app it gets setup automatically.