Log into your Apple Business Manager account and the first thing you should do is to enable “Custom Apps”. Click on Settings on the left sidebar, select Enrollment Information then enable Custom Apps.
Next, to get the DEP ID: Click on Settings on the left sidebar(near the bottom), then select Device Purchases to get the Organization DEP Customer ID. Then submit this DEP ID in your Podbean white label app setup page.
Once your app is ready, you can check how to distribute your custom B2B app here.