Synonyms for Meal ticket:

n.

Indian Giver, contributor, supplier, payer, a good/bad/big etc. tipper, paymaster, backer, source, donor. coupon, credit slip, gift certificate, bar code, docket, ecolabel, courtesy card, discount card, food coupon, food stamp. meal ticket (noun)
luncheon voucher.

Other synonyms:

donor, payer, supplier, Indian Giver, paymaster, backer. contributor. source. Other relevant words:
food stamp, backer.