MemberPress: Change the Member’s User Role After Subscription Cancelation

add_action('mepr-event-subscription-stopped', function($event) {

  $subscription = $event->get_data();

  $user = $subscription->user();

  $wp_user = get_user_by('id', $user->ID);

  if(!$wp_user) { return; }

  // Remove role

  $wp_user->remove_role( 'subscriber' );

  // Add role

  $wp_user->add_role( 'editor' );

});