After creating your app, you will be redirected to your app’s details page, where you’ll find the Client ID and Client Secret. Copy the Client ID, go to the chat, and use the command:
.setid + your Client ID

Example: .setid AHFdfkashfyu5724h
If you copied it correctly, a confirmation message will appear.

Now return to Spotify for Developers, on the same page where you copied your Client Secret, click View client secret and copy the value shown. Repeat the same process: go back to the chat and use the command:

.setsecret + your Client Secret
If it’s correct, a confirmation message will be sent.

You have completed this step. In the next step, you will authorize your app to use your Spotify account so the plugin can work properly.