---
title: Initialize CAS SDK
---
> ## Documentation Index
> Fetch the complete documentation index at: https://docs.page/cleveradssolutions/docs/llms.txt
> Use this file to discover all available pages before exploring further.

To display ads, you must initialize the Mobile Ads once, ideally at app launch.  

```cpp
#include "CASMobileAds.h"

UCASMobileAds::OnAdsInitialized.AddLambda([this](const FCASInitialConfig &Config) {
    if (Config.Error.IsEmpty()) {
        // Ads initialization completed
    } else {
        // Ads initialization failed with Config.Error
    }
    // The CAS SDK initializes if the error IsEmpty()
    FString InitErrorOrEmpty = Config.getError;
    FString UserCountryISO2OrEmpty = Config.CountryCode;
    
    // The user completes the consent flow
    ECASConsentFlowStatus ConsentFlowStatus = Config.ConsentFlowStatus; 
});

UCASMobileAds::InitializeMobileAds();
```
<Image width="271" alt="image" src="/assets/unreal/Initialize-CAS-1.png" />

The `OnAdsInitialized` event may be called with an error. In this case, the SDK will attempt to reinitialize and the listener will be called again until the error is resolved.

## Check initialized ads
You can also check whenever CAS was initialized. Use `IsInitializedAds` if you are unsure before using ad interfaces or want to do additional checks.
```cpp
UCASMobileAds::IsInitializedAds();
```

<Image width="144" alt="image" src="/assets/unreal/Initialize-CAS-2.png" />

## Retrieve the Version Number
To programmatically retrieve the SDK version number at runtime, the plugin provides the following method:
```cpp
UCASMobileAds::GetMobileAdsVersion();
```

<Image width="178" alt="image" src="/assets/unreal/Initialize-CAS-3.png" />

## (Optional) Trial ad-free interval
Set the time interval during which users can enjoy an ad-free experience while retaining access
to Rewarded Ads and App Open Ads formats. This interval is defined from the moment of the initial
app installation, in seconds. Within this interval, users enjoy privileged access to the
application's features without intrusive advertisements.

```cpp
int SecondsIn7Days = 604800;
UCASMobileAds::SetTrialAdFreeInterval(secondsIn7Days);
```
<Image width="185" alt="image" src="/assets/unreal/Initialize-CAS-4.png" />