How to send Referral Codes to Klaviyo

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If you want to send referral code to Klaviyo on every user registration, add below code. This is working for Referral plugin from version 4.1.4

add_action('wpgens_raf_new_user_referral_id', 'process_new_user_referral', 10, 2);

function process_new_user_referral($referral_id, $user_id) {
    // Get user data
    $user = get_userdata($user_id);
    $email = $user->user_email;

    // Send to Klaviyo
    send_to_klaviyo($email, $referral_id);
}

function send_to_klaviyo($email, $referral_id) {
    // Klaviyo API endpoint for retrieving profile
    $url = 'https://a.klaviyo.com/api/profiles/';

    // Your Klaviyo private API key
    $api_key = 'YOUR-PRIVATE-KEY';

    // Step 1: Retrieve Klaviyo Profile ID
    $response = wp_remote_get($url . "?filter=equals(email,\"" . urlencode($email) . "\")", [
        'headers' => [
            'Authorization' => 'Klaviyo-API-Key ' . $api_key,
            'Accept' => 'application/json',
            'Revision' => '2024-02-15'
        ]
    ]);

    if (is_wp_error($response)) {
        error_log('Failed to retrieve Klaviyo profile: ' . $response->get_error_message());
        return;
    }

    $body = json_decode(wp_remote_retrieve_body($response), true);
    if (empty($body['data'][0]['id'])) {
        error_log('Klaviyo profile not found for email: ' . $email);
        return;
    }

    $klaviyo_user_id = $body['data'][0]['id'];

    // Step 2: Update Klaviyo Profile with Referral ID
    $update_body = json_encode([
        'data' => [
            'type' => 'profile',
            'id' => $klaviyo_user_id,
            'attributes' => [
                'properties' => [
                    'raferral_code' => $referral_id
                ]
            ]
        ]
    ]);

    $update_response = wp_remote_request($url . $klaviyo_user_id . '/', [
        'method' => 'PATCH',
        'headers' => [
            'Authorization' => 'Klaviyo-API-Key ' . $api_key,
            'Content-Type' => 'application/json',
            'Accept' => 'application/json',
            'Revision' => '2024-02-15'
        ],
        'body' => $update_body
    ]);

    if (is_wp_error($update_response)) {
        error_log('Failed to update Klaviyo profile: ' . $update_response->get_error_message());
    } else {
        $update_body = wp_remote_retrieve_body($update_response);
        $update_data = json_decode($update_body, true);
        if (isset($update_data['errors'])) {
            error_log('Klaviyo API error: ' . print_r($update_data['errors'], true));
        }
    }
}