Zoho Integration with ActiveCampaign

When Adding a contact in Zoho creator it should add automatically on ActiveCampaign.
For that I am using workflow but it always returns:-

{"errors":[{"title":"Email address is required.","detail":"","code":"field_missing","error":"contact_email_was_not_provided","source":{"pointer":"/data/attributes/email"}}]}

I am using this code :-

m = Map();

m.put("email","abc@gmail.com");

h = Map();

h.put("content-type","application/x-www-form-urlencoded");

response = postUrl("https://shobhitagnihotri123.api-us1.com/api/3/contacts?api_action=contact_add&api_key=d13fe84cffb52d11060b3daadc75172982e4e16d21b3f57b5b1c09363a041fe2aa779aee",m,h,true); info response;