create new site collection with REST API

Question

I am looking for a no-code solution to provision sites using the "Send HTTP Request to Sharepoint" action in Flow. Can somebody please point me to the correct Sharepoint API (so no Graph) that lets me create a new modern site collection without group?

I tried /_api/GroupSiteManager/CreateGroupEx and /_api/GroupSiteManager/CreateGroup but both create a group. Also tried to Create Communication site but couldn't make it work, even with the sample on the page:

The property '__metadata' does not exist on type 'SP.Publishing.CommunicationSiteCreationRequest'. Make sure to only use property names that are defined by the type.

Any idea welcome, the goal is a modern site, no group, no powershell.

Answer 1

To create a modern communication site, you can use the below endpoint:

https://tenant.sharepoint.com/_api/SPSiteManager/Create

In the body, you need to send data as:

"request":
{
     "__metadata": { "type": "Microsoft.SharePoint.Portal.SPSiteCreationRequest" },
     Title: "Test Comm site",
     Lcid: 1033,
     Description: "",
     Classification: "",
     ShareByEmailEnabled: false,
     SiteDesignId: "00000000-0000-0000-0000-000000000000",
     Url: "https://tenant.sharepoint.com/sites/TestSite",
     WebTemplate: "SITEPAGEPUBLISHING#0",
     WebTemplateExtensionId: "00000000-0000-0000-0000-000000000000",     
}

Also, you need to set the headers as:

headers: {
          "Accept": "application/json;odata=verbose",
          "Content-Type": "application/json;odata=verbose;charset=utf-8",
          },