PropertyExpected TypeDescription Properties from Demand acceptedPaymentMethod LoanOrCredit  or
PaymentMethod  or
Text The payment method(s) that are accepted in general by an organization, or for some specific demand or offer. advanceBookingRequirement QuantitativeValue The amount of time that is required between accepting the offer and the actual usage of the resource or service. areaServed AdministrativeArea  or
GeoShape  or
Place  or
Text The geographic area where a service or offered item is provided. Supersedes serviceArea. asin Text  or
URL An Amazon Standard Identification Number (ASIN) is a 10-character alphanumeric unique identifier assigned by Amazon.com and its partners for product identification within the Amazon organization (summary from Wikipedia's article).

Note also that this is a definition for how to include ASINs in Schema.org data, and not a definition of ASINs in general - see documentation from Amazon for authoritative details. ASINs are most commonly encoded as text strings, but the [asin] property supports URL/URI as potential values too.

availability ItemAvailability The availability of this item—for example In stock, Out of stock, Pre-order, etc. availabilityEnds Date  or
DateTime  or
Time The end of the availability of the product or service included in the offer. availabilityStarts Date  or
DateTime  or
Time The beginning of the availability of the product or service included in the offer. availableAtOrFrom Place The place(s) from which the offer can be obtained (e.g. store locations). availableDeliveryMethod DeliveryMethod The delivery method(s) available for this offer. businessFunction BusinessFunction The business function (e.g. sell, lease, repair, dispose) of the offer or component of a bundle (TypeAndQuantityNode). The default is http://purl.org/goodrelations/v1#Sell. deliveryLeadTime QuantitativeValue The typical delay between the receipt of the order and the goods either leaving the warehouse or being prepared for pickup, in case the delivery method is on site pickup. eligibleCustomerType BusinessEntityType The type(s) of customers for which the given offer is valid. eligibleDuration QuantitativeValue The duration for which the given offer is valid. eligibleQuantity QuantitativeValue The interval and unit of measurement of ordering quantities for which the offer or price specification is valid. This allows e.g. specifying that a certain freight charge is valid only for a certain quantity. eligibleRegion GeoShape  or
Place  or
Text The ISO 3166-1 (ISO 3166-1 alpha-2) or ISO 3166-2 code, the place, or the GeoShape for the geo-political region(s) for which the offer or delivery charge specification is valid.

See also ineligibleRegion.

eligibleTransactionVolume PriceSpecification The transaction volume, in a monetary unit, for which the offer or price specification is valid, e.g. for indicating a minimal purchasing volume, to express free shipping above a certain order volume, or to limit the acceptance of credit cards to purchases to a certain minimal amount. gtin Text  or
URL A Global Trade Item Number (GTIN). GTINs identify trade items, including products and services, using numeric identification codes.

A correct gtin value should be a valid GTIN, which means that it should be an all-numeric string of either 8, 12, 13 or 14 digits, or a "GS1 Digital Link" URL based on such a string. The numeric component should also have a valid GS1 check digit and meet the other rules for valid GTINs. See also GS1's GTIN Summary and Wikipedia for more details. Left-padding of the gtin values is not required or encouraged. The gtin property generalizes the earlier gtin8, gtin12, gtin13, and gtin14 properties.

The GS1 digital link specifications expresses GTINs as URLs (URIs, IRIs, etc.). Digital Links should be populated into the hasGS1DigitalLink attribute.

Note also that this is a definition for how to include GTINs in Schema.org data, and not a definition of GTINs in general - see the GS1 documentation for authoritative details.

gtin12 Text The GTIN-12 code of the product, or the product to which the offer refers. The GTIN-12 is the 12-digit GS1 Identification Key composed of a U.P.C. Company Prefix, Item Reference, and Check Digit used to identify trade items. See GS1 GTIN Summary for more details. gtin13 Text The GTIN-13 code of the product, or the product to which the offer refers. This is equivalent to 13-digit ISBN codes and EAN UCC-13. Former 12-digit UPC codes can be converted into a GTIN-13 code by simply adding a preceding zero. See GS1 GTIN Summary for more details. gtin14 Text The GTIN-14 code of the product, or the product to which the offer refers. See GS1 GTIN Summary for more details. gtin8 Text The GTIN-8 code of the product, or the product to which the offer refers. This code is also known as EAN/UCC-8 or 8-digit EAN. See GS1 GTIN Summary for more details. includesObject TypeAndQuantityNode This links to a node or nodes indicating the exact quantity of the products included in an Offer or ProductCollection. ineligibleRegion GeoShape  or
Place  or
Text The ISO 3166-1 (ISO 3166-1 alpha-2) or ISO 3166-2 code, the place, or the GeoShape for the geo-political region(s) for which the offer or delivery charge specification is not valid, e.g. a region where the transaction is not allowed.

See also eligibleRegion.

inventoryLevel QuantitativeValue The current approximate inventory level for the item or items. itemCondition OfferItemCondition A predefined value from OfferItemCondition specifying the condition of the product or service, or the products or services included in the offer. Also used for product return policies to specify the condition of products accepted for returns. itemOffered AggregateOffer  or
CreativeWork  or
Event  or
MenuItem  or
Product  or
Service  or
Trip An item being offered (or demanded). The transactional nature of the offer or demand is documented using businessFunction, e.g. sell, lease etc. While several common expected types are listed explicitly in this definition, others can be used. Using a second type, such as Product or a subtype of Product, can clarify the nature of the offer.
Inverse property: offers mpn Text The Manufacturer Part Number (MPN) of the product, or the product to which the offer refers. priceSpecification PriceSpecification One or more detailed price specifications, indicating the unit price and delivery or payment charges. seller Organization  or
Person An entity which offers (sells / leases / lends / loans) the services / goods. A seller may also be a provider. Supersedes vendor, merchant. serialNumber Text The serial number or any alphanumeric identifier of a particular product. When attached to an offer, it is a shortcut for the serial number of the product included in the offer. sku Text The Stock Keeping Unit (SKU), i.e. a merchant-specific identifier for a product or service, or the product to which the offer refers. validFrom Date  or
DateTime The date when the item becomes valid. validThrough Date  or
DateTime The date after when the item is not valid. For example the end of an offer, salary period, or a period of opening hours. warranty WarrantyPromise The warranty promise(s) included in the offer. Supersedes warrantyPromise. 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. owner Organization  or
Person A person or organization who owns this Thing.
Inverse property: owns 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.

PropertyOn TypesDescription offers AggregateOffer  or
CreativeWork  or
EducationalOccupationalProgram  or
Event  or
MenuItem  or
Product  or
Service  or
Trip An offer to provide this item—for example, an offer to sell a product, rent the DVD of a movie, perform a service, or give away tickets to an event. Use businessFunction to indicate the kind of transaction offered, i.e. sell, lease, etc. This property can also be used to describe a Demand. While this property is listed as expected on a number of common types, it can be used in others. In that case, using a second type, such as Product or a subtype of Product, can clarify the nature of the offer. seeks Organization  or
Person A pointer to products or services sought by the organization or person (demand).