[rickdeckard]

Good question.

As per usual process of Google, Amazon, Apple et al, the process for this GDPR Request is done online AFTER you've logged in with your ID.

In case of Apple this is done in the "Manage your Apple Account" area of your account settings, for which you need to be able to login first.

I'm not sure these companies have a process in place to provide you this data without you having access to your own account. Filing a GDPR Request like that might turn into a topic requiring support from a lawyer / consumer protection agency...