Property	Expected Type	Description
Properties from MerchantReturnPolicySeasonalOverride
endDate	Date  or DateTime	The end date and time of the item (in ISO 8601 date format).
merchantReturnDays	Date  or DateTime  or Integer	Specifies either a fixed return date or the number of days (from the delivery date) that a product can be returned. Used when the returnPolicyCategory property is specified as MerchantReturnFiniteReturnWindow. Supersedes productReturnDays.
refundType	RefundTypeEnumeration	A refund type, from an enumerated list.
restockingFee	MonetaryAmount  or Number	Use MonetaryAmount to specify a fixed restocking fee for product returns, or use Number to specify a percentage of the product price paid by the customer.
returnFees	ReturnFeesEnumeration	The type of return fees for purchased products (for any return reason).
returnMethod	ReturnMethodEnumeration	The type of return method offered, specified from an enumeration.
returnPolicyCategory	MerchantReturnEnumeration	Specifies an applicable return policy (from an enumeration).
returnShippingFeesAmount	MonetaryAmount	Amount of shipping costs for product returns (for any reason). Applicable when property returnFees equals ReturnShippingFees.
startDate	Date  or DateTime	The start date and time of the item (in ISO 8601 date format).
Properties from Thing
additionalType	Text  or URL	An additional type for the item, typically used for adding more specific types from external vocabularies in microdata syntax. This is a relationship between something and a class that the thing is in. Typically the value is a URI-identified RDF class, and in this case corresponds to the use of rdf:type in RDF. Text values can be used sparingly, for cases where useful information can be added without their being an appropriate schema to reference. In the case of text values, the class label should follow the schema.org style guide.
alternateName	Text	An alias for the item.
description	Text  or TextObject	A description of the item.
disambiguatingDescription	Text	A sub property of description. A short description of the item used to disambiguate from other, similar items. Information from other properties (in particular, name) may be necessary for the description to be useful for disambiguation.
identifier	PropertyValue  or Text  or URL	The identifier property represents any kind of identifier for any kind of Thing, such as ISBNs, GTIN codes, UUIDs etc. Schema.org provides dedicated properties for representing many of these, either as textual strings or as URL (URI) links. See background notes for more details.
image	ImageObject  or URL	An image of the item. This can be a URL or a fully described ImageObject.
mainEntityOfPage	CreativeWork  or URL	Indicates a page (or other CreativeWork) for which this thing is the main entity being described. See background notes for details. Inverse property: mainEntity
name	Text	The name of the item.
potentialAction	Action	Indicates a potential Action, which describes an idealized action in which this thing would play an 'object' role.
sameAs	URL	URL of a reference Web page that unambiguously indicates the item's identity. E.g. the URL of the item's Wikipedia page, Wikidata entry, or official website.
subjectOf	CreativeWork  or Event	A CreativeWork or Event about this Thing. Inverse property: about
url	URL	URL of the item.

Property	On Types	Description
returnPolicySeasonalOverride	MerchantReturnPolicy	Seasonal override of a return policy.

Source

https://github.com/schemaorg/schemaorg/issues/2880

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