If you are running multiple sites on your Commerce Cloud instance, your REST calls need to specify which sites they apply to. There are two ways to specify the site:
For calls to any of the APIs, you can specify the site using the
x-ccsiteheader in the request.For calls to the Store API, you can explicitly include the domain name of the applicable site in the URL.
Note that if you do not specify a site in a call to the Store API, the call is directed to the default site. (See Configure Sites for a discussion of the default site.) If you do not specify a site in a call to the Admin API or the Agent API, the call is applied to the instance as a whole. For example, if you specify a site for the getOrders Admin endpoint, only orders associated with that site are returned; if you do not specify a site, orders associated with all sites are returned.

