Add payment meta information to the admin sales notification in Easy Digital Downloads

gistfile1.php

<?php

function my_child_theme_edd_sale_notification( $email_body, $payment_id, $payment_data ) {
	// retrieve payment meta array and unserialize it
	$payment_meta = maybe_unserialize( get_post_meta( $payment_id, '_edd_payment_meta', true ) );

	// add your fields here
	$company = $payment_meta['company'];
	$phone = $payment_meta['phone'];

	// append information to email body
	$email_body .= '<br /><br />' . '<strong>Additional Information</strong>' . '<br />';
	$email_body .= 'Company: ' . $company . '<br />';
	$email_body .= 'Phone: ' . $phone;

	return $email_body;
}
add_filter( 'edd_sale_notification', 'my_child_theme_edd_sale_notification', 10, 3 );