> 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/merchant-tokenization/visa-ctf-and-daf/implement-ctf-and-daf/synchronize-binding.md).

# Synchronize binding

Use `syncBindingState` to reconcile the **device binding** state between the Thales SDK and the Thales backend.

Call this when you suspect the SDK state is stale. This can happen after network errors, app reinstall, or interrupted device binding.

### SDK integration

Call `syncBindingState` and handle the result in the success or error callback.

{% tabs %}
{% tab title="Android" %}
{% hint style="warning" %}
This call is asynchronous.

Invoke the `runOnUiThread(Runnable)` callback when you need to update the UI.
{% endhint %}

```java
visaCTFHelper.syncBindingState(correlationId, 
                               vProvisionTokenId, 
                               new SyncBindingStateListener() {
            @Override
            public void onError(TMGClientException exception) { 
                // Handle error
            }

            @Override
            public void onSuccess(BindingState bindingState) {
                // Use bindingState to choose the next flow.
            }
        });
```

The SDK returns the current binding state in `onSuccess`, or an error in `onError`.
{% endtab %}

{% tab title="iOS" %}
{% hint style="warning" %}
This call is asynchronous.

Invoke the `DispatchQueue.main.async` callback when you need to update the UI.
{% endhint %}

```swift
let vProvisionedTokenID: String = ""
let correlationID: String = ""

// Start sync binding state
visaCTFHelper.syncBindingState(forVProvisionedTokenID: vProvisionedTokenID,
                                correlationID: correlationID) { (state, error) in
    if error == nil {
        // Use state to choose the next flow.
    } else {
        // Handle error
    } 
}
```

{% endtab %}
{% endtabs %}

### Next steps

Use the returned `BindingState` to continue with the right flow:

* `UNBOUND`: Start device binding. See [Create device binding (green flow)](/merchant-tokenization/visa-ctf-and-daf/implement-ctf-and-daf/create-device-binding-green-flow.md).
* `PENDING_ACTIVATION`: Resume device binding. This typically means the issuer required **step-up authentication** using an **ID\&V** method. See [Create device binding (yellow flow)](/merchant-tokenization/visa-ctf-and-daf/implement-ctf-and-daf/create-device-binding-yellow-flow.md).
* `BOUND`: Authenticate transactions. See [Authenticate a transaction](/merchant-tokenization/visa-ctf-and-daf/implement-ctf-and-daf/authenticate-a-transaction.md).


---

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