One very useful feature of developer.fil.com is the 'Try it out' feature which enables you to try out an API and view a response. This is not available for all items in the API catalogue, although for the majority it is.
To use this feature do the following:
1) Go to the catalogue and select the API you want to try out, make sure you are in the + API view
2) Click on the Authorize button near the top of the window
3) The following modal will appear - click on authorize and default credentials will automatically load.
4) You can now click close and you will notice that the Authorize button will appear locked.
5) Open the API method/end point you wish try out, locate and click on the try it out button(the padlock should be closed if authorized correctly as in point 2 and 3)
6) Enter valid parameters(use the info view to obtain these if unsure) and click execute, you will then see your response.