when I tried GET contacts api , the dates paramerter is ignoring. but we need to do filter by lastmodified (or any dates) using GET method only (not using search api, because it is POST method)
Hey, @MMurthy0 
I understand what you are asking for, but the Contacts API doesn’t accept search query parameters, as you noted. Either using the Search API or handling it with middleware or a similar external solution. You could get creative and leverage an Active List, poll the list membership at some frequency, and then submit the IDs to the BATCH Contacts endpoint to return more details. Or, you can look into Webhooks as an option for getting only Object records that have an update to a specific property, for example.
Best,
Jaycee