Add Salesforce REST or Chatter APIs to Your OAuth App
Step 1: Visit http://developer.force.com
Click on "DE Login or "Join" buttons. You'll be taken to the developer site at force.com. To create an application, go to your name, and select “Setup”.
Once you go to setup, under App Setup, select “Develop” → “Remote Access” → click on “New” button.
You’ll be presented with a Remote Access form. Fill out the items in red and click “Save”.
Once you save the application, you’ll be presented with the Consumer key. Click on “Click to reveal link” to view the Consumer Secret.
Copy the Consumer Key and Consumer Secret and return to Apigee to paste them into the setup form.