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

function mepr_change_role_canceled_subscription( $event ) {

  $subscription = $event->get_data();

  if( 123 != ( int ) $subscription->product_id ) { 

	  return; 

  }

  $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' );

}

add_action( 'mepr-event-subscription-stopped', 'mepr_change_role_canceled_subscription' );