If you have a Professional, Premium, or customized subscription, you will be given access to your API Key, a unique identifier that authenticates requests associated with your project.
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The API Key can be easily found by scrolling down to the bottom of the left-hand sidebar and clicking on "API Keys" under the "Developers" subheading:

With the API, you can upload your media files for insights extraction and transcription, download the resulting insights and webhooks, create an embed recorder or media - many more...!