Add new subscriber in a Klaviyo list API

In this article, I will explain you that, how we can insert a new record in klaviyo list using V2, for this I'm going to use CURL request. This API is used for creating profiles and managing list memberships and subscriptions. We will use below API to create a new subscriber in a list:

https://a.klaviyo.com/api/v2/list/LIST_ID/members?api_key=API KEY

My form has only 1 field email because I will created a simple html form for newsletter. You can include more fields in your form based on your requirements.

To add subscriber in a list you will need API_KEY and LIST_ID. I'm using the following code to add subscriber in klaviyo list.

<?php
	$apiKey = 'API KEY HERE';
        $data = array (
	'api_key' => $apiKey,
	'profiles' => array ('0' => array ( 'email' => 'EMAIL ADDRESS HERE' )),
	);

	$list_id = 'LIST ID HERE';
	$curl = curl_init();
	curl_setopt_array($curl, array(
		CURLOPT_URL => "https://a.klaviyo.com/api/v2/list/".$list_id."/members?api_key=".$apiKey,
		CURLOPT_RETURNTRANSFER => true,
		CURLOPT_CUSTOMREQUEST => "POST",
		CURLOPT_POSTFIELDS => json_encode($data),
		CURLOPT_HTTPHEADER => array(
			"cache-control: no-cache",
			"content-type: application/json",
		),
	));

	$response = curl_exec($curl);
	$err = curl_error($curl);
	curl_close($curl);
?>

How to get API Key & List ID in Klaviyo

Get Api Key

1. Go to account page after login from top right corner under your user name

2. After that click on API Keys under Settings

3. Copy and use API key in your code

Get List ID

1. Go to lists & segments and after that click on list setting of any list which you want to select

2. And after that, you will see a unique klaviyo list id