URL : https://us18.api.mailchimp.com/3.0//lists/{list_id}/members TYPE : POST HEADERS Basic Aauth : anystring: api key( 29d45fdfe158ddd9a679482955ff93c2-us18 ) SAMPLE PAYLOAD { "id" : "customer_001", "status": "subscribed", "email_address" : "piyush@wegile.com", "merge_fields":{ "FNAME":"Piyush", "LNAME":"Rawat" }, "opt_in_status" : true }