To synchronize tasks between e.q. Todoist and Aha we can use this API (using it now):
https://www.aha.io/api/resources/tasks#anchor-resource-tasks-example-get_all_tasks.
But there is no possibility to filter tasks we get from API. We need to take all task every time to synchronize it. No events for tasks too.
Please add filtering possibility or make the answer from API that newest task will be send first. Then we can take task by pagination and when we see old task, we can no longer take more data. I'm proposing using field "updated_at" in todos as an order by column.