Update user roles when subscription statuses change

subscriptions-user-roles.php

<?php
  add_action(
            'getpaid_subscription_status_changed',
            function( $subscription ) {
                $user = $subscription->get_customer();

                if ( empty( $user ) ) {
                    return;
                }
        
                if ( $subscription->is_active() ) {
                    // Update role.
                    $user->add_role( 'getpaid_subscriber' );
                } else {
                    // Update role.
                    $user->remove_role( 'getpaid_subscriber' );
                }
            }
        );