core + bib (Bibliographic Extension): terms relating to books and bibliography.

programMembershipUsed

Canonical URL: http://schema.org/programMembershipUsed

Thing > Property > programMembershipUsed

Any membership in a frequent flyer, hotel loyalty program, etc. being applied to the reservation.
Values expected to be one of these types
ProgramMembership
Used on these types
Reservation

Schema Version 3.3