{
  "access_token": str,
  "refresh_token": str,
  "expires_at": int,
}

{
  "id": int,
  "email": str,
  "created_at": str,
  "updated_at": str,
}

{  
  "email" : str,
  "password" : str
}

{
  "token" : <token_info>,
  "user" : <user_info>
}

{
  "email" : str,
  "password" : str
}

{
  "user" : <user_info>,
  "token_info" : <token_info>
}

{
  "refresh_token" : str,
}

{
  "result" : True,
}

{
  "id": int,
  "user": int,
  "memo": str,
  "amount": int,
  "created_at": str,
  "updated_at": str,
  "is_active": bool,
}

{
  "amount" : int, // biginteger field
  "memo" : str
}

{
  "result" : bool,
  "ledgers" : <ledger_info>
}

{
  "amount" : int, // nullable
  "memo" : str // nullable
}

{
  "result" : bool,
  "ledgers" : ledger_info
}

{

}

{
  "result" : bool,
  "ledgers" : <ledger_info>
}

{

}

{
  "result" : bool,
  "ledgers" : <ledger_info>
}

{

}

{
  "result" : bool,
  "ledgers" : [<ledger_info>]
}

{

}

{
  "result" : bool,
  "ledgers" : <ledger_info>
}