> Documentation index: [Saleor](/llms.txt) · [This section](/api-reference/payments/llms.txt)
> Source: https://docs.saleor.io/api-reference/payments/objects/transaction-initialize

# TransactionInitialize Object

Initializes a transaction session. It triggers the webhook `TRANSACTION_INITIALIZE_SESSION`, to the requested `paymentGateways`. There is a limit of 100 transaction items per checkout / order.

```graphql
type TransactionInitialize {
  transaction: TransactionItem
  transactionEvent: TransactionEvent
  data: JSON
  errors: [TransactionInitializeError!]!
}
```

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### Fields

<a id="transaction"></a>

#### [`transaction`](#transaction) ● [`TransactionItem`](/api-reference/payments/objects/transaction-item.md)

The initialized transaction.

<a id="transaction-event"></a>

#### [`transactionEvent`](#transaction-event) ● [`TransactionEvent`](/api-reference/payments/objects/transaction-event.md)

The event created for the initialized transaction.

<a id="data"></a>

#### [`data`](#data) ● [`JSON`](/api-reference/miscellaneous/scalars/json.md)

The JSON data required to finalize the payment.

<a id="errors"></a>

#### [`errors`](#errors) ● [`[TransactionInitializeError!]!`](/api-reference/payments/objects/transaction-initialize-error.md)

<a id="returned-by"></a>

### Returned By

[`transactionInitialize`](/api-reference/payments/mutations/transaction-initialize.md) mutation