Pro tip! Click images to view larger
Create an account on developer.infusionsoft.com
Login to the developer account
Click on "Get Started"
Scroll down and click on "OAuth Guide" under OAuth 2.0 Step 2
Under Step 3 click "Request Permission"
Copy and paste this link in a new tab. "https://signin.infusionsoft.com/app/oauth/authorize/client_id=(paste in the client ID which you have received on developer accounts page)"
Ensure that the you are logged in to the application
You will be taken to your Account central.
Click on "API Access"