> For the complete documentation index, see [llms.txt](https://docs.payments.thalescloud.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.payments.thalescloud.io/nfc-wallet-sdk-ios/implement-nfc-wallet/make-payments/implement-contactless-payment/5.-display-the-transaction-context.md).

# 5. Display the transaction context

Handle `ContactlessPaymentSession.Event.transactionCompleted` to show the payment status to the end user.

This event includes a `TransactionContext` that contains key details about the transaction.

### Handle the completion event

In your `ContactlessPaymentSession.eventStream` loop, handle:

* `.transactionCompleted(let transactionContext)`

Use `transactionContext` to update your UI and trigger any follow-up actions.

### TransactionContext fields

`TransactionContext` typically includes:

* `aid`: EMV application identifier (AID).
* `amount`: Transaction amount (formatted for display in your UI).
* `rawAmount`: Raw amount value as received from the terminal.
* `currencyCode`: ISO-4217 numeric currency code.
* `transactionDate`: Transaction date (YYMMDD, BCD-encoded).
* `transactionType`: Transaction type code (for example, purchase vs refund).
* `digitalCardID`: Digital card identifier used for the payment.
* `scheme`: Payment network (for example, Visa or Mastercard).
* `isTransit`: Indicates whether the transaction is a transit transaction.
* `transactionID`: Transaction identifier.

Refer to the following example code snippet for implementation instructions:

{% code title="Format and display transaction context" %}

```swift
func displayTransactionContext(_ context: TransactionContext) {
    // Set this to your locale.
    let locale = Locale(identifier: "en_US")

    // Map ISO-4217 numeric codes to alphabetic codes.
    // Expand this mapping based on your supported currencies.
    let iso4217NumToCode: [Int: String] = [
        978: "EUR",
        840: "USD"
    ]

    let currencyFormatter = NumberFormatter()
    currencyFormatter.locale = locale
    currencyFormatter.numberStyle = .currency

    if let currencyCode = iso4217NumToCode[context.currencyCode.bcdToInt()] {
        currencyFormatter.currencyCode = currencyCode
    }

    let rawDateFormatter = DateFormatter()
    rawDateFormatter.dateFormat = "yyMMdd"

    guard let transactionDate = rawDateFormatter.date(from: context.transactionDate.bcdToString()) else {
        // Fallback: skip date rendering if parsing fails.
        return
    }

    let displayDateFormatter = DateFormatter()
    displayDateFormatter.locale = locale
    displayDateFormatter.dateStyle = .medium

    let amountStr = currencyFormatter.string(from: context.amount as NSNumber) ?? "-"
    let dateStr = displayDateFormatter.string(from: transactionDate)

    let transactionTypeStr = context.transactionType.bcdToString()
    switch transactionTypeStr {
    case "00":
        // Purchase
        break
    case "20":
        // Refund / correction
        break
    default:
        // Unknown transaction type
        break
    }

    // Update your UI with amountStr, dateStr, scheme, isTransit, and transactionID.
}
```

{% endcode %}


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