GTM MemberPress Snippet.php

<?php

/**
 * Plugin Name: STT Tracking for Google Tag Manager 
 * Version: 1.0
 * Description: Push transaction details into the GTM Data Layer.
 * Author: Pablo Tocho, of DigiSavvy
 * Author URI: https://digisavvy.com
 * License: GPL-2.0+
 * License URI: http://www.gnu.org/licenses/gpl-2.0.txt
 * Text Domain: dgs
*/

if (!defined('ABSPATH')) {
	exit;
}

function memberpress_gtm_purchase_data() {
	if(isset($_GET['membership']) && isset($_GET['trans_num'])) {
		$transaction = MeprTransaction::get_one_by_trans_num($_GET['trans_num']);
    
		if(isset($transaction->id) && $transaction->id > 0) {
			$subscription = new MeprSubscription($transaction->subscription_id);;
			$user = $subscription->user();
			
			$purchase_data = array();
			if( $subscription ) {
				$purchase_data['transaction_coupon'] = 'Any';
				if( $transaction->coupon_id > 0 ) {
					$coupon = new MeprCoupon($transaction->coupon_id);
					$purchase_data['transaction_coupon'] = $coupon->post_name;
				}

				$purchase_data['transaction_total'] = $transaction->total;
				$purchase_data['transaction_sub_total'] = $transaction->amount;
				$purchase_data['customer_name'] = $user->first_name . $user->last_name;
				$purchase_data['customer_email'] = $user->user_email;
				$purchase_data['customer_membership_name'] = $user->user_login;

				error_log('Inserting the dataLayer script in the footer');

				?>
					<script>
						window.dataLayer = window.dataLayer || [];
						dataLayer.push(
							{
								"memberpressPurchaseData": {
									"customer_name" : "<?= $purchase_data['customer_name']; ?>",
									"customer_email" : "<?= $purchase_data['customer_email']; ?>",
									"transaction_total" : "<?= $purchase_data['transaction_total']; ?>",
									"transaction_sub_total" : "<?= $purchase_data['transaction_sub_total']; ?>",
									"transaction_coupon" : "<?= $purchase_data['transaction_coupon']; ?>",
								}
							}
						);
					</script>
				<?php

				//error_log('Coupon data is: ');
				//error_log( print_r( $coupon, true ) );

				//error_log('Transaction data is: ');
				//error_log( print_r( $transaction, true ) );
			}
		}
	}
}

add_action('wp_footer', 'memberpress_gtm_purchase_data');