When a source system does not provide API for bulk task retrieval, the OneList task adapter can implement the on-demand task sync for users who are actively using OneList so that those user’s tasks are updated more timely.
OneList registers the task sync request when user launches the OneList client app or selected to sync tasks manually. The adapter can get the requests using the /api/DataSync/GetSyncTaskRequests API then synchronise those user’s tasks with OneList. The adapter should do this periodically or listen to the OneList task sync event.