Is it legal to use 30 second preview via API?

[antonioalia7]

Hi, I'm creating an app and I wanted to know if it's legal to use the Spotify API to play a 30 second preview of the song.

Basically I would insert a button with the words "Listen to song preview", and then I would have to insert something else?

Can there be a button on the same screen where the preview is to download another free app, obviously?

Do I also need to specify where the preview is playing from?

Thanks and sorry, I'm a little confused about this.