Click Create App. Name it anything (e.g. "Elijah Playlist Tool"). Set the Redirect URI to https://admin.elijahpaul.com (or wherever this page is hosted). Tick Web API. Save.
3
On your app's dashboard, click Settings and copy your Client ID and Client Secret into the fields above. Save.
4
Click Connect to Spotify and log in. You only need to do this once per browser.
5
Paste your master Spotify playlist URL into the field above and click Load. This saves all your correct track versions as a lookup database.
Create Client Playlist
Paste the client's setlist, match tracks to your master versions, then push directly to Spotify.