CC BY 4.0’s whole price is a credit. Put it where people (and platforms) look.
YouTube
In the description:
Music: “Track Title” by Purrple Cat https://purrplecat.com Licensed under CC BY 4.0: https://creativecommons.org/licenses/by/4.0/
Twitch / livestreams
A panel or the stream description, plus a !song command if you can.
Music by Purrple Cat (purrplecat.com) · CC BY 4.0
TikTok / Reels / Shorts
In the caption: Music: “Track Title” by Purrple Cat (CC BY 4.0).
Podcasts
In the show notes of every episode that uses the track.
Games
On the credits screen and the store page.
The packing slip builds a single credit block when you used several tracks.