Check per-furnisher field coverage before running a query

curl --request POST \
  --url https://api.example.com/v1/products/check \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "network_ids": [
    "3c90c3cc-0d44-4b50-8888-8dd25736052a"
  ],
  "product_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "policy_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "furnishing_entity_ids": [
    "3c90c3cc-0d44-4b50-8888-8dd25736052a"
  ],
  "consent_id": "<string>",
  "consumer_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "business_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
}
'

{
  "product_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "entities": [
    {
      "furnishing_entity_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
      "complete": true,
      "models": [
        {
          "model_name": "<string>",
          "met_count": 123,
          "total_count": 123,
          "fields": [
            {
              "field_name": "<string>",
              "met": true
            }
          ]
        }
      ],
      "furnishing_entity_name": "<string>",
      "network_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
    }
  ],
  "consumer_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "business_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
}