Filter a SELECT query with predicates passed as single hstore value

For an API I am building I am supposed to write a function with a single hstore argument containing colname => value pairs so that queries may be filtered with a WHERE clause including an indefinite amount of subclauses. I currently have the following function definition (not a MWE):

CREATE OR REPLACE FUNCTION api.func( conds HSTORE )
RETURNS TABLE (LIKE api.tab) AS 
$$
BEGIN
	RETURN QUERY
		SELECT * 
		FROM api.tab 
		WHERE -- conds here
        LIMIT 25 ;
END;
$$ LANGUAGE plpgsql;

I am not really sure how to continue. Could someone please give me a hint?