Subscription Activate
To implement the Subscription activate API using the SDK, implement the abstract method processSubscriptionActivate from the PurchaseController:
/// <summary>
/// Proccesses Subscription Activation requests.
/// </summary>
/// <returns>A <see cref="Task{T}"/> of <see cref="SubscriptionResponse"/> or an exception if subscriptions are not supported.</returns>
protected override Task<SubscriptionResponse> ProcessSubscriptionActivate(SubscriptionActivateRequest request);