The question above is why I want to place ads in my app

@matos94 said:
API key
Can the developer license be used in my app that I will put on Google Play?

Yes

The question above is why I want to place ads in my app

When I created my API Key I chose between these options:

Developer

• You are an individual
• Your project is still in development
• Your project is non profit
• Your project is ad supported

Professional

• You represent a company
• Your project is for profit (not ad supported)
• You are an OEM or hardware vendor

I believe your App falls under
Your project is ad supported

@ticao2 Thank you very much for the answer. So I will use the first Developer option in the app with advertisements. =)