[WP] Where to get 500px Consumer Key?

To get 500px consumer key login to your 500px acount and go to Acount > Applications.

If you don't have registered app, you need to click on "Register Your Application" green button, and entered details.
500px___Applications-1.jpg

After you register your app click on "See application details" and copy your Consumer Key.
500px___Applications.jpg