private static function _migrate_300() {

		$text  = '<p><strong>' . __( 'Welcome to the LifterLMS Helper', 'lifterlms' ) . '</strong></p>';
		$text .= '<p>' . __( 'This plugin allows your website to interact with your subscriptions at LifterLMS.com to ensure your add-ons stay up to date.', 'lifterlms' ) . '</p>';
		// Translators: %1$s = Opening anchor tag; %2$s = closing anchor tag.
		$text .= '<p>' . sprintf( __( 'You can activate your add-ons from the %1$sAdd-Ons & More%2$s screen.', 'lifterlms' ), '<a href="' . admin_url( 'admin.php?page=llms-add-ons' ) . '">', '</a>' ) . '</p>';

		$keys   = array();
		$addons = llms_get_add_ons();
		if ( ! is_wp_error( $addons ) && isset( $addons['items'] ) ) {
			foreach ( $addons['items'] as $addon ) {

				$addon = llms_get_add_on( $addon );

				if ( ! $addon->is_installable() ) {
					continue;
				}

				$option_name = sprintf( '%s_activation_key', $addon->get( 'slug' ) );

				$key = get_option( $option_name );
				if ( $key ) {
					$keys[] = get_option( $option_name );
				}

				delete_option( $option_name );
				delete_option( sprintf( '%s_update_key', $addon->get( 'slug' ) ) );

			}
		}

		if ( $keys ) {

			$res = LLMS_Helper_Keys::activate_keys( $keys );

			if ( ! is_wp_error( $res ) ) {

				$data = $res['data'];
				if ( isset( $data['activations'] ) ) {

					// Translators: %d = Number of keys that have been migrated.
					$text .= '<p>' . sprintf( _n( '%d license has been automatically migrated from the previous version of the LifterLMS Helper', '%d licenses have been automatically migrated from the previous version of the LifterLMS Helper.', count( $data['activations'] ), 'lifterlms' ), count( $data['activations'] ) ) . ':</p>';

					foreach ( $data['activations'] as $activation ) {
						LLMS_Helper_Keys::add_license_key( $activation );
						$text .= '<p><em>' . $activation['license_key'] . '</em></p>';
					}
				}
			}
		}

		LLMS_Admin_Notices::flash_notice( $text, 'info' );

		// Clean up legacy options.
		$remove = array(
			'lifterlms_stripe_activation_key',
			'lifterlms_paypal_activation_key',
			'lifterlms_gravityforms_activation_key',
			'lifterlms_mailchimp_activation_key',
			'llms_helper_key_migration',
		);

		foreach ( $remove as $opt ) {
			delete_option( $opt );
		}

	}