Add custom field to Paid Memberships Pro Checkout Email using Register Helper

custom-field-register-helper.php

<?php
/**
 * This will check for !!company_name!! in the emails body and replace it with the 'company_name' metadata (created by Register Helper).
 * Add this code to your PMPro Customizations Plugin - https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */
 
 function my_pmpro_email_body( $body, $email ) {
	//only checkout emails + strict comparison
	if ( false !== strpos( $email->template, 'checkout' ) ) {
		global $current_user;

		$company_name = get_user_meta( $current_user->ID, 'company_name', true );
		$body = str_replace( '!!company_name!!', $company_name, $body);
	}
 
	return $body;
}
add_filter( 'pmpro_email_body', 'my_pmpro_email_body', 10, 2 );