If you are a developer, we provide API, that you may use in your own apps. The term "app" is used loosely here. It doesn't matter if what you want to build is a mobile app, browser extension, Discord bot or anything else you can imagine.
All you need to start is a regular account. Then, after you register an app here, all necessary keys will be generated for you and you can start developing.
If you want multiple people to manage your apps, consider creating standalone account.
All necessary information about what's available can be found in Documentation