Create sites (as a partner)

Creates sites for the specified merchant, managed by the specified partner. Given a list of names and urls, this endpoint will create a new site, a liveclient app and a test client app if the site doesn't exist for the given merchant. If the site already exists, both site and client apps will be updated. The endpoint returns a list `sites` with info about the sites created/updated. If an error happens during the creation or update of one or more sites, they will be returned in the `errors` list. Otherwise, this list will be empty. For use by Supertab partners. <!-- autogenerated scope notes --> **Required Scopes:** business:site:write