/// <summary>
/// Adds a subscription key to the user.
/// </summary>
/// <param name='operations'>
/// The operations group for this extension method.
/// </param>
/// <param name='azureRegion'>
/// Supported Azure regions for Cognitive Services endpoints. Possible values
/// include: 'westus', 'westeurope'
/// </param>
/// <param name='userSubscriptionCreateObject'>
/// Subscription key object.
/// </param>
/// <param name='cancellationToken'>
/// The cancellation token.
/// </param>
public static async Task AddSubscriptionKeyAsync(this IUser operations, AzureRegions azureRegion, UserSubscriptionCreateObject userSubscriptionCreateObject = default(UserSubscriptionCreateObject), CancellationToken cancellationToken = default(CancellationToken))
{
(await operations.AddSubscriptionKeyWithHttpMessagesAsync(azureRegion, userSubscriptionCreateObject, null, cancellationToken).ConfigureAwait(false)).Dispose();
}