Get billingadd on products

curl --request GET \
  --url http://127.0.0.1:3000/api/billing/add-on-products \
  --header 'Authorization: Bearer <token>'

[
  {
    "id": "<string>",
    "type": "base",
    "catalog": "cloud",
    "unitAmount": 123,
    "prices": [
      {
        "id": "<string>",
        "legacyIds": [
          "<string>"
        ],
        "productId": "<string>",
        "type": "<string>",
        "interval": "month",
        "intervalCount": 123,
        "unitAmount": 123,
        "currency": "<string>"
      }
    ],
    "trialPeriodInDays": 123
  }
]