To create your Intuit Developer account, follow the steps below.
Navigate to developer.intuit.com
On the menu bar click Sign up, which will open the Create your account form:
Fill out the form and click Create Account, which redirects you to developer homepage.
Navigate to Account Profile provide a few details to fill out your profile and click Submit.
Watch the email inbox you specified for a confirmation message and a second message that contains some introductory links to get you started.
To create a new app, navigate to Apps dashboard and click on Create an app.
The Dashboard page supports online development of QuickBooks Online applications; developers of QuickBooks Desktop applications should proceed to download and install the Desktop SDK.
Next up, Download and install the Desktop SDK.