# Invocation

13. You can trigger the Truecaller profile verification dialog anywhere in your app flow by calling the following method

```
TcSdk.getInstance().getAuthorizationCode(this, launcher)
```

where the launcher is derived in step 5 ([Implementing Callback](https://docs.truecaller.com/truecaller-sdk/~/revisions/nSPuRXISTt65PkMyKKJS/android/oauth-sdk-3.2.0/integration-steps/implementing-callbacks))\
\
In case isOAuthFlowUsable() method returns false, implying that the Truecaller app is not present on the device, you can take the user to your app screen and continue with the verification flow for non-Truecaller users or implement your fallback verification mechanism.

{% hint style="info" %}
Please note that the instance you pass in the method above should be of the activity/fragment where you have initialized the SDK.
{% endhint %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.truecaller.com/truecaller-sdk/android/oauth-sdk-3.2.0/integration-steps/invocation.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.