How to download an MDM signing certificate and its trust certificates from the iOS provisioning portal

Hey, I am new to this forum and also new for apple developer. I have a company and need install MDM server for employee device management. I have already have a MDM server and now what I needed is to "Download an MDM signing certificate and its trust certificates from the iOS provisioning portal" from the doc https://developer.apple.com/documentation/devicemanagement/implementing_device_management/setting_up_push_notifications_for_your_mdm_customers I need help to tell me 1, How to Download an MDM signing certificate and its trust certificates 2, Where is the iOS provisioning portal 3, Is Apple developer account enough for this process

How to download an MDM signing certificate and its trust certificates from the iOS provisioning portal
 
 
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