fire-entry-event-call.js

//make api call to inject contact to a journey  
if (email != null && accessToken != null) {
    var email = Request.GetQueryStringParameter("email");
    var headerNames = ["Authorization"];
    var headerValues = ["Bearer " + accessToken];
    var jsonBody = {
        "ContactKey": email,
        "EventDefinitionKey": "APIEvent-xxxxxx",  //provide journey EVENT DEFINITION KEY
        "Data": {
            "email_field": email
        }
    };

    var requestUrl = rest_instance_url + "/interaction/v1/events";
    var fireEntryEvent = HTTP.Post(requestUrl, contentType, Stringify(jsonBody), headerNames, headerValues);