Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
voucher [ˈvautʃər] n (for meal) (also: luncheon voucher) тало́н на обе́д; (with petrol, cigarettes etc) ва́учер; (receipt) распи́ска#
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.