Offer (3)

http://purl.org/goodrelations/v1#GoogleCheckout

cmt5ucbr80bua01qgr5wwxvyf

https://www.example.com/checkout?items={VARIANT_ID_1}:{Quantity_1},{VARIANT_ID_2}:{Quantity_2}&discount={DISCOUNT_CODE}&store_id={pickup_store_id}