curl --request GET \
  --url https://api.loyalty.dog/v2/giftcards/programs/{programId}/reports/expiration-warnings \
  --header 'Authorization: Bearer <token>'

{
  "reportId": "<string>",
  "generatedAt": "2023-11-07T05:31:56Z",
  "warnings": [
    {
      "cardId": "<string>",
      "cardNumber": "<string>",
      "customerEmail": "<string>",
      "customerName": "<string>",
      "daysUntilExpiry": 123,
      "warningLevel": "<string>",
      "expiresAt": "2023-11-07T05:31:56Z",
      "balance": "<string>"
    }
  ],
  "count30d": 123,
  "count60d": 123,
  "count90d": 123
}