Deletes a supplier provider from your company. It no longer appears in lists and can no longer be used for supplier requests; branches already saved as Zuper vendors are not removed. If it was the preferred supplier, the company has no preferred supplier until you set another one or connect a new provider. You can connect a new provider of the same type afterwards. Requires supplier integration to be enabled for the company; otherwise the request fails with 400. Admin only: the API key must belong to an admin user; other roles receive 405 Access Denied.