php – How to read a field of the Cayenne platform to show it elsewhere?

I was looking for information on this subject and could not find anything. All about Arduino, and one that I want to test, is to get the value of a field (Channel) located on the Cayenne platform (IoT) to view it on another site. , but I can not find documentation on how to do it in PHP, Java, C #, etc.

I wanted to know if someone who knows how to use the platform can guide me, thanks.