> 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/check-device-binding.md).

# Check device binding

Call this before you start device binding, or before you authenticate a transaction.

Use `getBindingState` (Thales SDK) to check whether a token is already bound on the device.

### SDK integration

{% tabs %}
{% tab title="Android" %}

```java
String vProvisionedTokenId = ""; // Example
try {
    BindingState state = visaCTFHelper.getBindingState(vProvisionedTokenId);
} catch (TMGClientException e) {
    // Handle error
}
```

{% endtab %}

{% tab title="iOS" %}

```swift
let vProvisionedTokenID = "" // Example
do {
    let state = try visaCTFHelper.bindingState(forVProvisionedTokenID: vProvisionedTokenID)
} catch let error {
    // Handle the error
}
```

{% endtab %}
{% endtabs %}

Depending on the returned state, continue with one of these flows:

* `UNBOUND`

  Start device binding. See [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 state 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 [Process a transaction](/merchant-tokenization/visa-ctf-and-daf/implement-ctf-and-daf/authenticate-a-transaction.md).


---

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