HRESULT XStoreAcquireLicenseForPackageAsync(  
         const XStoreContextHandle storeContextHandle,  
         const char* packageIdentifier,  
         XAsyncBlock* async  
)  

void CALLBACK PackageLicenseLostCallback(void* context)
{
    printf("**** License Lost ****\r\n");
}

void CALLBACK AcquireLicenseForPackageCallback(XAsyncBlock* asyncBlock)
{
    XStoreLicenseHandle licenseHandle = nullptr;

    HRESULT hr = XStoreAcquireLicenseForPackageResult(
        asyncBlock,
        &licenseHandle);

    if (FAILED(hr))
    {
        printf("Failed retrieve the license handle: 0x%x\r\n", hr);
        return;
    }

    bool isValid = XStoreIsLicenseValid(licenseHandle);
    printf("isValid: %s\r\n", isValid ? "true" : "false");

    if (isValid)
    {
        XTaskQueueHandle taskQueueHandle = reinterpret_cast<XTaskQueueHandle>(asyncBlock->context);
        XTaskQueueRegistrationToken token = { 0 };

        //  Todo: Save the licenseHandle to hold onto it for the life of the app or until you unload the package.
        // This allows us to be notified if the license becomes invalid and we need to handle unloading the content.
        hr = XStoreRegisterPackageLicenseLost(
            licenseHandle,
            taskQueueHandle,
            nullptr,
            PackageLicenseLostCallback,
            &token);

        if (FAILED(hr))
        {
            XStoreCloseLicenseHandle(licenseHandle);
            printf("Failed register license lost callback: 0x%x\r\n", hr);
            return;
        }

        // This would normally go in your cleanup code when releasing the license
        hr = XStoreUnregisterPackageLicenseLost(
            licenseHandle,
            token,
            true);

        if (FAILED(hr))
        {

            // This would normally go in your cleanup code when releasing the license
            XStoreCloseLicenseHandle(licenseHandle);
            printf("Failed unregister license lost callback: 0x%x\r\n", hr);
            return;
        }
    }

    XStoreCloseLicenseHandle(licenseHandle);
}

void AcquireLicenseForPackage(XStoreContextHandle storeContextHandle, XTaskQueueHandle taskQueueHandle, const char* packageIdentifier)
{
    auto asyncBlock = std::make_unique<XAsyncBlock>();
    ZeroMemory(asyncBlock.get(), sizeof(*asyncBlock));
    asyncBlock->queue = taskQueueHandle;
    asyncBlock->context = taskQueueHandle;
    asyncBlock->callback = AcquireLicenseForPackageCallback;

    HRESULT hr = XStoreAcquireLicenseForPackageAsync(
        storeContextHandle,
        packageIdentifier,
        asyncBlock.get());

    if (FAILED(hr))
    {
        printf("Failed to get product for package: 0x%x\r\n", hr);
        return;
    }
}