Source

File: wp-includes/class-wp-customize-manager.php

public function get_nonces() {
		$nonces = array(
			'save'                     => wp_create_nonce( 'save-customize_' . $this->get_stylesheet() ),
			'preview'                  => wp_create_nonce( 'preview-customize_' . $this->get_stylesheet() ),
			'switch_themes'            => wp_create_nonce( 'switch_themes' ),
			'dismiss_autosave_or_lock' => wp_create_nonce( 'customize_dismiss_autosave_or_lock' ),
			'override_lock'            => wp_create_nonce( 'customize_override_changeset_lock' ),
			'trash'                    => wp_create_nonce( 'trash_customize_changeset' ),
		);

		/**
		 * Filters nonces for Customizer.
		 *
		 * @since 4.2.0
		 *
		 * @param string[]             $nonces Array of refreshed nonces for save and
		 *                                     preview actions.
		 * @param WP_Customize_Manager $this   WP_Customize_Manager instance.
		 */
		$nonces = apply_filters( 'customize_refresh_nonces', $nonces, $this );

		return $nonces;
	}