List vouchers

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

{
  "success": true,
  "data": {
    "vouchers": [
      {
        "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"
      }
    ]
  }
}