mypmpro-email-headers-email-confirmation.php

<?php //do not copy

function my_pmpro_email_headers_email_confirmation( $headers, $email ) {
	
	if( ! function_exists( 'pmproec_isEmailConfirmationLevel' ) ) {
		return $headers;
	}

	// BCC email confirmation emails to another email address
	if ( 
		! empty( $email->data['membership_id'] ) && 
		pmproec_isEmailConfirmationLevel( $email->data['membership_id'] ) && 
		strpos( $email->template, "checkout" ) !== false 
	) {

		$headers[] = 'Bcc:' . 'otheremail@domain.com';
		// $headers[] = 'Bcc:' . 'otheremail@domain.com,two@domain.com,three@domain.com'; //Example with multiple BCC emails
	}
 
	return $headers;
}
add_filter( 'pmpro_email_headers', 'my_pmpro_email_headers_email_confirmation', 10, 2 );