To find your DEP Customer ID, log into https://idmsa.apple.com/IDMSWebAuth/login.html?disable2SV=true&rv=2&appIdKey=09273cfd6b56a8ce5af52a0153d1d796d364e03a36c6e87ef21e92c77a83ef3f&path=/qforms/web/index/avs&language=US-EN&country=NZ and click on your name in the upper right corner, choosing Organisation Details from the drop-down menu will show your ID number.