Changes to Get Quantity Deals

the response property data/items/ends_at became nullable for the status 200

the response property data/items/max_uses_per_cart became nullable for the status 200

the response property data/items/starts_at became nullable for the status 200

the response property links/items/url became nullable for the status 200

the response property next_page_url became nullable for the status 200

the response property prev_page_url became nullable for the status 200

added the optional property links/items/page to the response with the 200 status

removed the optional property data/items/product/stock_count from the response with the 200 status