According to a recent survey, the number of SaaS companies has grown to more than 25,000 worldwide. In general, businesses that subscribe to SaaS products work with multiple SaaS vendors and expect that the apps will integrate with each other. To address this, some SaaS companies build bespoke integrations into their apps, while others go with an embedded integration platform to address their customers' integration needs.
Regardless of the approach you are taking for integrations with your app, you'll find that most integrations should fit into a few common patterns. Knowing these patterns will help whether you find yourself in the midst of an integration project, just getting started with building out your API, or in the early days of planning a new SaaS app.