Here is the link for Multi-Member Rebate Form for players that were members of more than one club.

Golfers who are active members of more than one OGA Member Club may request a rebate of $20 per additional membership, OR $25 in credit to the OGA Golf Course, OR a $20 donation to OGA Junior Golf.

(For example, a golfer who is an active member of Club ABC and Club XYZ, both OGA Member Clubs may request a $20 rebate because he/she is a member of two OGA Member Clubs. If that golfer is an active member of three OGA Member Clubs, a $40 rebate may be requested.)

The rebate request period is Sept 1 through Dec 31.