curl --request GET \
  --url https://api.highwayapi.ai/openapi/v1/billing/bill/list \
  --header 'Authorization: <authorization>' \
  --header 'Content-Type: <content-type>'

{
  "bills": [
    {
      "userId": "<string>",
      "startTime": "<string>",
      "endTime": "<string>",
      "billingMethod": "<string>",
      "productName": "<string>",
      "category": "<string>",
      "ownerID": "<string>",
      "billNum0": "<string>",
      "billNum1": "<string>",
      "basePrice0": "<string>",
      "basePrice1": "<string>",
      "discountPrice0": "<string>",
      "discountPrice1": "<string>",
      "amount": "<string>",
      "voucherAmount": "<string>",
      "payAmount": "<string>",
      "payAmountDisplay": "<string>",
      "pricePrecision": "<string>",
      "productId": "<string>"
    }
  ]
}