> 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/renew-oda-certificates.md).

# Renew ODA certificates

## Overview

Offline Data Authentication (ODA) may be use an ODA certificate during a Visa contactless payment.

To avoid payment interruptions, renew the ODA certificate before it expires.

{% hint style="info" %}
The NFC Wallet SDK supports ODA certificate renewal for Visa only.
{% endhint %}

## SDK Integration

### Check whether renewal is needed

Use `DigitalCard` to check whether a digital card supports ODA and whether its certificate is expired:

* `DigitalCard.isODASupported: Bool`
* `DigitalCard.needsODARenewal: Bool`

```swift
guard let digitalCard = await digitalCardManager.digitalCard(forID: digitalCardID) else { return }
let isODASupported = await digitalCard.isODASupported
let needsODARenewal = await digitalCard.needsODARenewal

guard isODASupported else { return }
guard needsODARenewal else { return }

// Renew the certificate.
```

Perform this check:

* After **NFC Wallet SDK** initialization.
* After a payment.
* When the card is set as default.
* After connectivity returns (offline → online).

### Renew the ODA certificate

Use `ODARenewalService` to renew a Visa digital card ODA certificate:

* `ODARenewalService.renewIfNeeded(digitalCardID: String, isForced: Bool)`

```swift
try await odaRenewalService.renewIfNeeded(digitalCardID: digitalCard.digitalCardID)
```

To improve the end user experience, trigger renewal at predictable moments:

* After the default card is set.
* After a payment has been completed.

{% hint style="info" %}
`renewIfNeeded()` checks both `digitalCard.isODASupported` and `digitalCard.needsODARenewal`.

You can call it directly without a separate pre-check.
{% endhint %}

{% hint style="warning" %}
`renewIfNeeded()` is a no-op if:

* The `digitalCard` is not a Visa card.
* `digitalCard.isODASupported` is `false`.
* `digitalCard.needsODARenewal` is `false`.

Set `isForced` to `true` to renew even when `digitalCard.needsODARenewal` is `false`:

```swift
try await odaRenewalService.renewIfNeeded(
    digitalCardID: digitalCard.digitalCardID,
    isForced: true
)
```

The default value for `isForced` is `false`.
{% endhint %}


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