Run the headless server commerce and try the following URL and execute some queries:
http://localhost:43180/graphiql
Try the following query and adjust the site parameter if necessary:
{
catalogs(siteId: "coremedia_site_id") {
__typename
id
externalId
siteId
}
}
A list of all available catalogs should appear. This only works if the demo site is available and connected to a commerce adapter. The available query API can be found below the "Docs" link in the upper right corner.