When you create a new app, Accounting generates credentials that you can use to work with the API.
Login to your Sage Developer account.
Click Create App.
Read our full guide on Creating an app
Enter a name and Callback URL for your app. You can optionally provide an alternative email address and homepage URL for your app, but this isn’t required at this stage.
Not sure what your Callback URL is? Read our guide on Authentication
Your app has now been created! You’ll now have a Client ID and Client Secret to use at the next step.
Next: Upgrade your account