You can register Azure Stack with Azure to download marketplace items from Azure and to set up commerce data reporting back to Microsoft.
Registration is recommended because it enables you to test important Azure Stack functionality, like marketplace syndication and usage reporting.
After you register Azure Stack, usage is reported to Azure commerce. You can see it under the subscription you used for registration. Azure Stack Development Kit users aren't charged for any usage they report. Registering Azure Stack incurs no cost on your
Azure subscription.
I suggest you refer the documentation
Register Azure Stack with Azure for a step-step instructions on the registration procedure/process.
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