Add a product price

{
  "id": "4032597f-1765-44db-ad08-f6f0a096efc9",
  "productsId": "5ffd2ec8-ec75-4916-97f1-005240897d21",
  "unitPrice": 40.1,
  "unitPriceInstallment": 40.1,
  "pricingModelId": "8eaa8da0-be76-4e03-823f-152c5a7aa0b5",
  "billingTypesId": "73da57b8-6677-4ae2-afc5-cae76bff7d70",
  "recurringUsageTypesId": "c25c0237-1cd8-4f69-b10e-60d8e07b33ef",
  "billingPeriodId": "d211b9e5-4639-416f-b48e-bc7ccda4164f",
  "recurringMeteredUsageId": "9814ea3d-7640-4ebc-be53-eb9f34700a3b",
  "currencyId": "56ea7c95-dd22-46b4-a978-4319e6728c96",
  "internalDescription": "Sample product description",
  "description": "Sample product description",
  "recurringTrialPeriodDays": 40,
  "priceTiers": [
    {
      "id": "2031a086-7e87-47d6-8c28-b904b4951507",
      "productPricesId": "8eaa8da0-be76-4e03-823f-152c5a7aa0b5",
      "flatPrice": 40.1,
      "unitPrice": 40.1,
      "upTo": 2
    }
  ],
  "metadata": [
    {
      "key": "sample key",
      "value": "sample value"
    },
    {
      "key": "another key",
      "value": "another value"
    }
  ],
  "features": [
    {
      "key": "sample key",
      "value": "sample value"
    },
    {
      "key": "another key",
      "value": "another value"
    }
  ]
}