Retrieve a voucher

curl -X GET "https://api.live.paisr.tech/v2/vouchers/{voucher_id}" \
  -H "Authorization: Bearer <access_token>" \
  -H "User-Agent: MyApp/1.0" \
  -H "Content-Type: application/json"

{
  "success": true,
  "data": {
    "id": "vch_123456",
    "description": "End of the month sale",
    "code": "EOTM10",
    "amount": 10,
    "redeems": {
      "count": 75,
      "max": 100
    },
    "archived": false,
    "created_at": "2024-01-15T10:30:00Z",
    "expires_at": "2024-01-15T10:30:00Z"
  }
}