# `Codat.Expenses.Transactions`
[🔗](https://github.com/iamkanishka/codat.git/blob/v1.0.0/lib/codat/expenses/expenses.ex#L148)

Push expense transactions into an active sync session.

Transactions represent individual expense events (card purchases, ATM withdrawals,
refunds) that will be reconciled into the customer's accounting software.

## Transaction Types

- `"payment"` — a purchase/expense
- `"refund"` — a refund of a previous expense
- `"reward"` — a loyalty/cashback reward
- `"chargeback"` — a disputed transaction
- `"transferIn"` / `"transferOut"` — fund transfers
- `"adjustmentIn"` / `"adjustmentOut"` — accounting adjustments

## Example

    {:ok, _} = Codat.Expenses.Transactions.create(
      client, company_id, sync_id,
      [
        %{
          id: "txn-001",
          type: "payment",
          issueDate: "2024-01-15T00:00:00Z",
          currency: "USD",
          currencyRate: 1.0,
          contactRef: %{id: "supplier-id", type: "Supplier"},
          lineItems: [
            %{
              accountRef: %{id: "account-id"},
              description: "Office supplies",
              netAmount: 99.99,
              taxAmount: 8.00,
              taxRateRef: %{id: "tax-rate-id"},
              trackingRefs: [%{id: "tracking-id", dataType: "trackingCategories"}]
            }
          ]
        }
      ]
    )

# `create`

```elixir
@spec create(
  Codat.Client.t() | String.t(),
  String.t(),
  String.t() | list(),
  list() | keyword()
) ::
  {:ok, map()} | {:error, Codat.Error.t()}
```

Creates (pushes) expense transactions into a sync session.

Accepts a list of transaction objects.

## Example

    {:ok, result} = Codat.Expenses.Transactions.create(
      client, company_id, sync_id, [transaction1, transaction2]
    )

# `update`

```elixir
@spec update(
  Codat.Client.t() | String.t(),
  String.t(),
  String.t(),
  String.t() | map(),
  map() | keyword()
) :: {:ok, map()} | {:error, Codat.Error.t()}
```

Updates an existing transaction in a sync session.

---

*Consult [api-reference.md](api-reference.md) for complete listing*