curl --request GET \
  --url https://api.collectpure.com/sandbox/listings/get/v1 \
  --header 'x-api-key: <api-key>'

{
  "data": {
    "listings": [
      {
        "listingId": "<string>",
        "productId": "<string>",
        "variantId": "<string>",
        "productTitle": "<string>",
        "sku": "<string>",
        "material": "<string>",
        "quantity": 123,
        "price": 123,
        "priceDollars": 123,
        "spotPremium": 123,
        "spotPremiumDollar": 123,
        "expiresAt": "<string>"
      }
    ],
    "total": 123
  }
}