If you code in c# no doubt you’ve worked with linq, json, xml and mysql in many shapes and sizes. These are the things I would suggest looking into first.
The api is just deserialized json strings (generally returned on one line, there are exceptions, so build for it), serialize it and work with the data.
Other than that, let your imagination go wild. Good luck 
edit: This site will help you with the api calls - throw the example data in the documentation into it and it will parse a class structure for use with the serializer. jsonutils.com
you can have a look at that if you want a headstart on it.