I want to use the spotify api to build a simple audio player embedded into a chrome extension. I've integrated the auth flow and I'm able to get a token to use for the api requests. I'm looking at the documentation to find a way to play the user playlists or searched tracks but I'm not able to find any useful information. They have only this SDK but a premium account is needed.
Is possible to use the spotify uri to play a full track or playlist after authentication?
No, there's currently no way to play the full song using the Web API. If you want full tracks to be playable from a website, you can use the Spotify Play Button. If you want to build a mobile application, you can do playback of full tracks using the Android and/or iOS SDK.