Use gravity forms to create a new attendee for a RSVP list in addEvent.com

gravity-and-addEvent.php

<?php
/** 
 * simple function that will create a new attendee to an Event in addEvent
 *
 * Works with gravity forms by hooking into the gform_after_submission
 ***/
function gotr_create_attendee($entry, $form) {
    $url = "https://www.addevent.com/api/v1/oe/rsvps/attendee/create/";
    $token = "XX_YOUR_TOKEN_HERE_XX"; //AddEvent Token
    $eventId = "XX_EVENT_ID_HERE_XX";  //The event Id in AddEvent
    
    //define forms variables here
    $name = rgar($entry, "13.3") . " " . rgar($entry, "13.6");
    $email = rgar($entry, "6");
    $attending = rgar($entry, "16"); //1(going) 2(maybe) 3(not going)    
  
    //https://www.addevent.com/c/documentation/events-api
    $postData = array(
        "token" => $token,
        "event_id" => $eventId,
        "name" => $name,
        "email" => $email,
        "attending" => $attending,
        "notify" => "active",
    );
    
    $ch = curl_init();
    
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_POST, true);
    curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($postData));
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    
    $response = curl_exec($ch);

    if (curl_errno($response)) {
        $error_msg = curl_error($ch);
    }

    curl_close($ch);

    if (isset($error_msg)) {
        GFCommon::log_debug(__METHOD__ . " Curl error during adding attendee " . $error_msg);
    } else {
      GFCommon::log_debug(__METHOD__ . " Attendee created " . $response);
    }    
}

add_action("gform_after_submission_27", "gotr_create_attendee", 10,2);