Thank you for the inquiry and for your patience.
As our current system of API distribution turned out to be inefficient and unable to satisfy the massive demand, we will be changing our sales model.
In March 2020, our sales process will be fully automatized. More info coming soon at api.windy.com.
@Emilieve Your question is very elementary and concerns the basics of web development rather than the Windy API. So I'm sorry, but this forum is for discussion specific to our API, not the basics of development. Try Stackoverflow or Google.