amelia_2_mailchimp_hook.php

<?php 

/**
* HOW-TO INSTALL
*  - Download and edit the DEFINE-ME variables in this file 
*  - Upload the file to your server (for example into your WordPress installation directory)
*  - Go to the Amelia Settings Page and click on Integrations. 
*  - Go to the "Webhooks" Tab
* 
*    URL: Provide your URL that matches to where you uploaded this php file on your server. 
*    E.g. https://my-domain.com/amelia_2_mailchimp_hook.php
*    
*    Type: "Event" 
*    I did not test it with another Type than Event
*    
*    Action: "Booking completed"
**/

// DEFINE-ME: YOUR MAILCHIMP API KEY
define('API_KEY', 'XXXXXXXXXXX');

// DEFINE-ME: MAILCHIMP SERVER (FOR EXAMPLE: https://us17.api.mailchimp.com)
define('SERVER', 'https://us17.api.mailchimp.com');

// DEFINE-ME: MAILCHIMP LIST ID
define('LIST_ID', '12345abcde');

// DEFINE-ME: CUSTOMER default Language
define('LANGUAGE', 'de');

$input = json_decode(file_get_contents('php://input'));

$firstName =  $input->bookings->{'0'}->customer->firstName;

$lastName =  $input->bookings->{'0'}->customer->lastName;

$email =  strtolower($input->bookings->{'0'}->customer->email);

$phone = $input->bookings->{'0'}->customer->phone;

// EXAMPLE ON HOW TO READ A CUSTOM FIELD WHERE THE USER CAN SELECT WHETER TO SUBSCRIBE OR NOT
//$newsletter = strtolower($input->bookings->{'0'}->customFields->{'7'}->value);
//if (strpos($newsletter, "yes") === false) {
//  echo 'Noop';
//  return;
//}

$postData = array(
    "email_address" => $email,
    "email_type" => "html",
    "status_if_new"=>"subscribed",
    "tags"=> array('amelia_booking'),
    "language" => LANGUAGE,
    "merge_fields" => array(
	    "FNAME" => "$firstName",
	    "LNAME" => "$lastName"
	)
);

$ch = curl_init(SERVER.'/3.0/lists/'.LIST_ID.'/members'.'/'.md5($email));

curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

curl_setopt($ch, CURLOPT_HTTPHEADER, [
    'Content-Type: application/json',
    'Authorization: Bearer '.API_KEY
]);

curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'PUT');

curl_setopt($ch, CURLOPT_POSTFIELDS,json_encode($postData));

$response = curl_exec($ch);

curl_close($ch);

echo 'Done';

//var_dump($response);

?>