How do you access the NFL's API's?

I've been trying to access or find away to access data from NFL.com, but have not found it yet. There is public documentation on these sites:

http://ift.tt/1NmSAkn

but these docs do not tell you how to get a client id or client secret.

I've also tried:

http://ift.tt/1iz1pL0

The documentation says that you need to send an email to fantasy.football@nfl.com to get the app key. I sent an email a while ago and a follow up and I've received no responses.

You can send requests to these API's and they will respond telling you that you have invalid credentials.

Have you had any success with this? Am I doing something wrong? Are these sites out of date?