Where can I find my Google Play License key?

Hi there I’ve published my game on Google Play and I’ve decided to add advertisements to it, so I was thinking of configuring it. I’ve tried to follow the guide for implementing ads but it seems I need a Google Play License key. I’ve looked all over for it on the developer console but can’t seem to find it, as I don’t have the section called Google Services & API’s when I access the app.

I don’t seem to have the Developer Tools panel option anywhere.

I would really appreciate if anyone could help me, thank you very much in advance.

After you clicked your app on Google Play Console, click ‘Monetization Setup’, then you can find your Google Play License Key on ‘Licensing’ part.