Basic Ontraport referral tracking for Restrict Content Pro

gistfile1.php

<?php
/*
 * Plugin Name: Restrict Content Pro - OntraPort Referral Tracking
 * Description: Very basic referral tracking for onraport and Restrict Content Pro
 */

function pw_rcp_ontraport_referrals( $payment_id, $args, $amount ) {
	
	global $rcp_options;

	$payments = new RCP_Payments;

	$last_payment = $payments->last_payment_of_user( $args['user_id'] );

	// Check if this is the subscribers first payment. We only send referrals on the first one
	if( $last_payment && $layment_payment->id != $payment_id ) {
		return;
	}

	$user_object   = get_userdata( $args['user_id'] );
	$email         = $user_object->user_email;
	$first_name    = $user_object->first_name;
	$last_name     = $user_object->last_name;
	$item_price_1  = rcp_get_subscription_price( rcp_get_subscription_id( $args['user_id'] ) );
	$external_id_1  = rcp_get_subscription_name( rcp_get_subscription_id( $args['user_id'] ) );

	$referral_url = "https://postmasculine.ontraport.net/p?order_id={$payment_id}&E-Mail={$email}&First_Name={$first_name}&Last_Name={$last_name}&item_external_id_1={$external_id_1}&item_price_1={$item_price_1}&item_qty_1=1";

	// Send the request to OntraPort
	wp_remote_get( $referral_url );

}
add_action( 'rcp_insert_payment', 'pw_rcp_ontraport_referrals', 10, 3 );