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The following pages describe the processes involved.
https://faqenteluk.entelatlassian.co.uknet/2020servicedesk/11customer/13/dn-apk-store/kb/view/102662430
https://faqenteluk.entelatlassian.co.uknet/2020servicedesk/11customer/19/dn-poc-server-configuration/kb/view/102432971