If you have the name and location, use lookup: location_name & address to retrieve the Placekey of a specific POI or to fill out any fields you may be missing.

query {
  lookup(
    query: {
      location_name: "Locanda Ravello"
      street_address: "172 E Prospect Ave"
      city: "Danville"
      region: "CA"
      iso_country_code: "US"
    }
  ) {
    placekey
    safegraph_core {
      location_name
      street_address
      city
      region
      iso_country_code
      postal_code
    }
  }
}

{
  "data": {
    "lookup": {
      "placekey": "222-222@5vg-9y8-7h5",
      "safegraph_core": {
        "location_name": "Locanda Ravello",
        "street_address": "172 E Prospect Ave",
        "city": "Danville",
        "region": "CA",
        "iso_country_code": "US",
        "postal_code": "94526"
      }
    }
  },
  "extensions": {
    "row_count": 1,
    "version_date": "1635494405__2021_10"
  }
}