Create sub-site in SharePoint Online on create of account entity record in CRM Online Organization without using "Microsoft.SharePoint.Client" DLL

Hi,

I want to create a sub-site in SharePoint Online on create of account entity record in my CRM Online organization.

I don't want to use"Microsoft.SharePoint.Client"as the use of this DLL requires installation of SharePoint Client Components on the client server. As my CRM environment is Online, I cannot use this DLL. So, I am trying to use REST APIs to implement the functionality.
Does anyone know how to achieve this?