WP_REST_Meta_Fields::delete_meta_value( int $object_id, string $meta_key, string $name ): true|WP_Error

Source

protected function delete_meta_value( $object_id, $meta_key, $name ) {
	$meta_type = $this->get_meta_type();

	if ( ! current_user_can( "delete_{$meta_type}_meta", $object_id, $meta_key ) ) {
		return new WP_Error(
			'rest_cannot_delete',
			/* translators: %s: Custom field key. */
			sprintf( __( 'Sorry, you are not allowed to edit the %s custom field.' ), $name ),
			array(
				'key'    => $name,
				'status' => rest_authorization_required_code(),
			)
		);
	}

	if ( null === get_metadata_raw( $meta_type, $object_id, wp_slash( $meta_key ) ) ) {
		return true;
	}

	if ( ! delete_metadata( $meta_type, $object_id, wp_slash( $meta_key ) ) ) {
		return new WP_Error(
			'rest_meta_database_error',
			__( 'Could not delete meta value from database.' ),
			array(
				'key'    => $name,
				'status' => WP_Http::INTERNAL_SERVER_ERROR,
			)
		);
	}

	return true;
}

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