You can create app following the steps below:
Register an EasyStore partner account if you don’t have one
After logged in, go to “Apps” sections
Click the “Create app” button at the top right corner
You can fill in the essential information only to create the app:
If you don’t have a valid App URL and Redirection URL at the moment, can simply put any URL for these two fields. You can update it later in the app details page.
After app created, you can find the Client ID and Client Secret that is required for the app installation process.