-d '{"contact_uid":"123456", "event_uid" : "pageview", "params" : {"account_uid" : "78910", "visit_url" : "http://myproduct.com/onboarding", "visit_ip" : "XX.XX.XX.XX", "visit_agent" : "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.130 Safari/537.36"}' \