public function submit_fields( $posted_data, $location, $fields, $action ) {

		$validate = $this->validate_fields( $posted_data, $location, $fields, $action );
		if ( is_wp_error( $validate ) ) {
			return $validate;
		}

		// Sanitize.
		$posted_data = $this->validator->sanitize_fields( $posted_data, $fields );

		$user_id = $this->insert( $action, $posted_data, $fields );
		if ( is_wp_error( $user_id ) ) {
			return $this->submit_error( $user_id, $posted_data, $action );
		}

		if ( 'registration' === $action ) {

			/**
			 * Deprecated user creation hook.
			 *
			 * @since Unknown.
			 * @deprecated 5.0.0
			 *
			 * @param int    $user_id     WP_User ID of the newly created user.
			 * @param array  $posted_data Array of user-submitted data.
			 * @param string $location    Form location.
			 */
			do_action_deprecated(
				'lifterlms_created_person',
				array( $user_id, $posted_data, $location ),
				'5.0.0',
				'lifterlms_user_registered'
			);

			/**
			 * Fire an action after a user has been registered.
			 *
			 * @since 3.0.0
			 * @since 5.0.0 Moved from `LLMS_Person_Handler::register()`.
			 *
			 * @param int    $user_id     WP_User ID of the user.
			 * @param array  $posted_data Array of user submitted data.
			 * @param string $location    Form location.
			 */
			do_action( 'lifterlms_user_registered', $user_id, $posted_data, $location );

		} elseif ( 'update' === $action ) {

			/**
			 * Fire an action after a user has been updated.
			 *
			 * @since 3.0.0
			 * @since 5.0.0 Moved from `LLMS_Person_Handler::update()`.
			 *
			 * @param int    $user_id     WP_User ID of the user.
			 * @param array  $posted_data Array of user submitted data.
			 * @param string $location    Form location.
			 */
			do_action( 'lifterlms_user_updated', $user_id, $posted_data, $location );

		}

		return $user_id;

	}