Implimenting Oauth on laravel

I am trying to convert this row query to laravel migration

CREATE TABLE oauth_clients 
(
    client_id VARCHAR(80) NOT NULL, 
    client_secret VARCHAR(80) NOT NULL, 
    redirect_uri VARCHAR(2000) NOT NULL, 
    grant_types VARCHAR(80), 
    scope VARCHAR(100), 
    user_id VARCHAR(80), 
    CONSTRAINT client_id_pk
    PRIMARY KEY (client_id)
);

But I am confused about last two lines.

Can any one help to do this. Thanks

via Chebli Mohamed