@NID You don't actually need the hosting account IDs. When manually adding an existing 20i hosting account to an order in Upmind, you can use the domain name in the username field then press "Get Info" from the order product "Manage" tab, and the system will grab and store the rest of the details needed to make subsequent provision requests to that 20i hosting account. If you need further help, best to contact us directly via support ticket.
https://docs.upmind.com/docs/getting-help-from-upmind