What does 'to make call asynchronously' mean for Create/Update Leads in REST APIs
I'm trying to update Leads into Marketo by REST API. When meeting parameter 'asyncProcessing', I get 2 kinds of understanding: 1. If false, we have to wait for last request to return response before sending next request out. if true, we could send all requests out one by one and wait for each of them returnning response until all completed. 2. If false, we have to send request and wait for response one by one. If true, we could get a handle for each request and wait for status of all handles to be completed. Is there a correct one in the 2 understandings? If the 2nd is correct, which API could be used to get the status of a handle?