package com.uwetrottmann.getglue.entities;

public class GetGlueCheckIn {

    public String id;

}

package com.uwetrottmann.getglue.entities;

public class GetGlueCheckIn {

    /**
     * The object id of the interaction related to the check-in.
     */
    public String id;

}

Add description to GetGlueCheckIn id field.