curl --request POST \
  --url https://api.useautumn.com/v1/products/{product_id} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "id": "<string>",
  "name": "<string>",
  "is_add_on": true,
  "is_default": true,
  "group": "<string>",
  "archived": true,
  "items": [
    {
      "feature_id": "<string>",
      "included_usage": 123,
      "interval": "minute",
      "interval_count": 123,
      "entity_feature_id": "<string>",
      "usage_model": "prepaid",
      "price": 123,
      "tiers": [
        {
          "to": 100,
          "amount": 10
        }
      ],
      "billing_units": 123,
      "reset_usage_when_enabled": true
    }
  ],
  "free_trial": {
    "length": "<string>",
    "unique_fingerprint": false,
    "duration": "day",
    "card_required": true
  }
}'

{
  "id": "Pro Product",
  "name": "Pro Plan",
  "group": null,
  "env": "sandbox",
  "is_add_on": false,
  "is_default": false,
  "archived": false,
  "version": 1,
  "created_at": 1761296829908,
  "items": [
    {
      "type": "price",
      "feature_id": null,
      "interval": "month",
      "interval_count": 1,
      "price": 20,
      "display": {
        "primary_text": "$20",
        "secondary_text": "per month"
      }
    },
    {
      "type": "priced_feature",
      "feature_id": "words",
      "included_usage": 1000,
      "interval": "month",
      "interval_count": 1,
      "price": 0.5,
      "usage_model": "pay_per_use",
      "billing_units": 1000,
      "reset_usage_when_enabled": true,
      "entity_feature_id": null,
      "display": {
        "primary_text": "1,000 Words",
        "secondary_text": "then $0.5 per 1,000 Words"
      }
    },
    {
      "type": "feature",
      "feature_id": "dashboard",
      "entity_feature_id": null,
      "display": {
        "primary_text": "Dashboard"
      }
    },
    {
      "type": "feature",
      "feature_id": "messages",
      "included_usage": 10,
      "interval": "month",
      "interval_count": 1,
      "reset_usage_when_enabled": true,
      "entity_feature_id": null,
      "display": {
        "primary_text": "10 Messages"
      }
    }
  ],
  "free_trial": {
    "duration": "day",
    "length": 7,
    "unique_fingerprint": false,
    "card_required": true
  },
  "base_variant_id": null,
  "scenario": "new"
}