t() :: %Stellar.Horizon.Transaction{
  created_at: DateTime.t(),
  envelope_xdr: String.t(),
  fee_charged: String.t(),
  fee_meta_xdr: String.t(),
  hash: String.t(),
  id: String.t(),
  ledger: non_neg_integer(),
  max_fee: non_neg_integer(),
  memo: String.t(),
  memo_type: String.t(),
  operation_count: non_neg_integer(),
  paging_token: String.t(),
  result_meta_xdr: String.t(),
  result_xdr: String.t(),
  signatures: list(),
  source_account: String.t(),
  source_account_sequence: non_neg_integer(),
  successful: boolean(),
  valid_after: DateTime.t(),
  valid_before: DateTime.t()
}