Merchant API products resource gained certification links, UK energy labels and offer-level video links

The Merchant API's October release added several attributes to the products sub-API: certification document and label links, United Kingdom energy efficiency certification enums, a mileage allowance for vehicle installments, and offer-level video links.

The certification document and label links let merchants point to the underlying certificate rather than only naming a certification code, and the UK energy efficiency enums bring the API in line with the separate UK energy label requirements. Offer-level video links attach a video to an individual offer instead of the product group.