In SharePoint Online there is a site collection called “Extranet”. On this site, users can fill in a form to request a new site collection. The requested site collection will then be automatically created using a custom site template. Is this at all possible and, if so, how would I do it?
I would take a look at this solution from the Office 365 Patterns and Practices team:Â https://github.com/OfficeDev/PnP-Partner-Pack