How to add Provider using a subdomain

Provider docs: https://support.bluebillywig.com/advanced-topics/oembed-service/
oEmbed specs: https://oembed.com/

https://*.bbvms.com/p/*/c/*.html?inheritDimensions=true&placementOption=default appears to be a valid resource URL.

The provider endpoint URL, as specified by bbvms.com is https://<publication>.bbvms.com/oembed/; however, the endpoint URL cannot contain wildcards. I'm not sure how you'd do this at runtime off the top of my head. You might need to decorate the media.oembed.resource_fetcher service with custom code and modify the ResourceFetcher::fetchResource() method to modify the URL before the resource is fetched.