curl --request GET \
  --url https://api.example.com/api/transactions/summary \
  --header 'Authorization: Bearer <token>'

[
  {
    "sum_inflow": 123,
    "total_inflow": 123,
    "sum_outflow": 123,
    "total_outflow": 123,
    "month": 123,
    "year": 123
  }
]