My account had some issues on creation which were resolved with a previous post. However, when going through this tutorial - http://docs.apigee.com/api-services/tutorials/secure-calls-your-api-through-oauth-20-client-credenti... - I realized I never had the default resources which are present on account creation, such as these:
Is there any way these can be added to my account?
Solved! Go to Solution.
You can create them manually if they are missing. Please find more details regarding same.
Above proxy is not valid anymore since Yahoo updated security access to API. Find more about same here and here.
Instead of above proxy, I would suggest to use any other public API as proxy. For Example, See attached google books api proxy attached. You can create a proxy in Apigee using Proxy bundle option.
https://www.googleapis.com/books/v1/volumes?q=node
http://YOURORGNAME-test.apigee.net/googlebooks?q=node
googlebooks-rev1-2016-03-29.zip
After above step, you will have all the things needed to continue with securing your API Proxy with OAuth client credentials. We will be updating documentation soon to reflect changes.
Keep us posted if you have any queries implementing same.