hasTierRequirement

A requirement for a user to join a membership tier, for example: a CreditCard if the tier requires sign up for a credit card, A UnitPriceSpecification if the user is required to pay a (periodic) fee, or a MonetaryAmount if the user needs to spend a minimum amount to join the tier. If a tier is free to join then this property does not need to be specified.

Values expected to be one of these types

Used on these types