What does "for development purposes only" mean?
The map is gray and you get the message “for development purposes only”? This means it's time to integrate an API key and/or create a billing account. These are two basic requirements for using Google Maps services. We will help you make the necessary transition.
Contact us at firstname.lastname@example.org stating the domain in which you use Google Maps. We can help you create an API key. Take advantage of the opportunity to set up a billing account through us and benefit from numerous advantages.