code: public Observable<Page<WebhookInner>> listByAutomationAccountAsync(final String resourceGroupName, final String automationAccountName, final String filter) {
          return listByAutomationAccountWithServiceResponseAsync(resourceGroupName, automationAccountName, filter)
              .map(new Func1<ServiceResponse<Page<WebhookInner>>, Page<WebhookInner>>() {
                  @Override
                  public Page<WebhookInner> call(ServiceResponse<Page<WebhookInner>> response) {
                      return response.body();
                  }
              });
      }
docs: Retrieve a list of webhooks.
  
  @param resourceGroupName Name of an Azure Resource group.
  @param automationAccountName The name of the automation account.
  @param filter The filter to apply on the operation.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the PagedList&lt;WebhookInner&gt; object