public function ajax_subscription() {

		// Bail if subscriptions are not active
		if ( ! bbp_is_subscriptions_active() ) {
			bbp_ajax_response( false, esc_html__( 'Subscriptions are no longer active.', 'bbpress' ), 300 );
		}

		// Bail if user is not logged in
		if ( ! is_user_logged_in() ) {
			bbp_ajax_response( false, esc_html__( 'Please login to subscribe.', 'bbpress' ), 301 );
		}

		// Get user and topic data
		$user_id = bbp_get_current_user_id();
		$id      = ! empty( $_POST['id']   ) ? intval( $_POST['id'] )         : 0;
		$type    = ! empty( $_POST['type'] ) ? sanitize_key( $_POST['type'] ) : 'post';

		// Bail if user cannot add favorites for this user
		if ( ! current_user_can( 'edit_user', $user_id ) ) {
			bbp_ajax_response( false, esc_html__( 'You do not have permission to do this.', 'bbpress' ), 302 );
		}

		// Get the object
		if ( 'post' === $type ) {
			$object = get_post( $id );
		}

		// Bail if topic cannot be found
		if ( empty( $object ) ) {
			bbp_ajax_response( false, esc_html__( 'Subscription failed.', 'bbpress' ), 303 );
		}

		// Bail if user did not take this action
		if ( ! isset( $_POST['nonce'] ) || ! wp_verify_nonce( $_POST['nonce'], 'toggle-subscription_' . $object->ID ) ) {
			bbp_ajax_response( false, esc_html__( 'Are you sure you meant to do that?', 'bbpress' ), 304 );
		}

		// Take action
		$status = bbp_is_user_subscribed( $user_id, $object->ID )
			? bbp_remove_user_subscription( $user_id, $object->ID )
			:    bbp_add_user_subscription( $user_id, $object->ID );

		// Bail if action failed
		if ( empty( $status ) ) {
			bbp_ajax_response( false, esc_html__( 'The request was unsuccessful. Please try again.', 'bbpress' ), 305 );
		}

		// Put subscription attributes in convenient array
		$attrs = array(
			'object_id'   => $object->ID,
			'object_type' => $type,
			'user_id'     => $user_id
		);

		// Add separator to topic if favorites is active
		if ( ( 'post' === $type ) && ( bbp_get_topic_post_type() === get_post_type( $object ) ) && bbp_is_favorites_active() ) {
			$attrs['before'] = ' | ';
		}

		// Action succeeded
		bbp_ajax_response( true, bbp_get_user_subscribe_link( $attrs, $user_id, false ), 200 );
	}