You don’t need to access the product catalog to specify what product you want to send. You can find the product ID by enabling Developer Mode on Goody’s website, or you can use the product’s URL in the create order batch payload. However, you can still access the product catalog if your use case can benefit from it. To access the product catalog, make a request (using your API key) to: 
GET https://api.sandbox.ongoody.com/v1/products
Authorization: Bearer YOUR_GOODY_API_KEY
This endpoint returns the products that are available to send. The list of products can change as products are added and removed. The product object includes the brand name, price, brand shipping price, copy like subtitles, variant information, and product imagery. You can paginate the product catalog by passing the ?page= query parameter (the first page is 1) and the ?per_page query parameter (maximum 100) to paginate through the list. An example response might look like: 
{
  "data": [
    {
      "id": "5821e50e-6a56-4144-bca2-3f41fbd699c0",
      "name": "Dozen Cookies",
      "brand": {
        "id": "30e28df2-730e-4763-81bc-d528f0ac6a2a",
        "name": "Cookie Company",
        "shipping_price": 1000
      },
      "subtitle": null,
      "subtitle_short": null,
      "recipient_description": "",
      "variants_label": "Flavor",
      "variants_num_selectable": 1,
      "variants": [
        {
          "id": "5eab976a-614c-41cf-a46f-8eca96748fbf",
          "name": "Chocolate Chip",
          "subtitle": "Classic chocolate chip.",
          "image_large": {
            "url": "https://assets.ongoody.com/image.png",
            "width": 1000,
            "height": 500
          }
        },
        {
          "id": "95592e6d-0bd3-49e9-ad2b-0112232e31d6",
          "name": "Oatmeal",
          "subtitle": "Delicious oatmeal.",
          "image_large": {
            "url": "https://assets.ongoody.com/image.png",
            "width": 1000,
            "height": 500
          }
        },
        {
          "id": "fe10b3ac-02b4-4b4e-b5cc-d16303fb1091",
          "name": "Sugar",
          "subtitle": "Tasty sugar.",
          "image_large": {
            "url": "https://assets.ongoody.com/image.png",
            "width": 1000,
            "height": 500
          }
        }
      ],
      "images": [
        {
          "id": "4fdc04a5-35e8-4789-84b9-c84259918f36",
          "image_large": {
            "url": "https://assets.ongoody.com/image.png",
            "width": 1000,
            "height": 500
          }
        }
      ],
      "price": 1000,
      "price_is_variable": false,
      "restricted_states": []
    }
  ],
  "list_meta": {
    "total_count": 1
  }
}
For more information, including the schema of the Product object, check out the API reference for the products endpoint.