Create postgresql user with only access to a few tables

For future reference:

su postgres
psql
CREATE USER pg_fulfillment;
GRANT CONNECT ON DATABASE my_database TO pg_fulfillment;
ALTER USER pg_fulfillment WITH PASSWORD 'pw';
REVOKE ALL PRIVILEGES FROM pg_fulfillment;
GRANT SELECT, UPDATE, INSERT ON TABLE mytable TO pg_fulfillment;
GRANT USAGE, SELECT, UPDATE ON SEQUENCE mytable_seq_id TO pg_fulfillment;