here's the question Please summarize the contents according to the question :((

Wayfair primarily generated net revenue through product sales on its family of sites.

Wayfair recognizes net revenue on product sales through Wayfair's family of sites using the gross method when Wayfair has concluded it controls the product before it is transferred to the customer. Wayfair controls products when it is the entity responsible for fulfilling the promise to the customer and takes responsibility for the acceptability of the goods, assumes inventory risk from shipment through the delivery date, has discretion in establishing prices and selects the suppliers of products sold. Wayfair recognizes net revenue from sales of its products upon delivery to the customer. As Wayfair ships a large volume of packages through multiple carriers, actual delivery dates may not always be available and as such Wayfair estimates delivery dates based on historical data.

Net revenue from product sales includes shipping costs charged to the customer and is recorded net of taxes collected from customers, which are recorded in other current liabilities and are remitted to governmental authorities. Cash discounts and rebates earned by customers at the time of purchase and estimates for sales return allowances are deducted from gross revenue in determining net revenue.

Wayfair maintains a membership rewards program for customer purchases made with our private label Wayfair credit card and co-branded Mastercard ("Credit Card Program"). In exchange for providing intellectual property as part of the Credit Card Program, we record net revenues based on spending activity and the profitability of the card portfolio. Spending activity of the underlying accounts represents customer purchases used with their respective cards, and the profitability of the card portfolio is based on the financial performance of the underlying credit portfolio.

Net revenue from contracts with customers is disaggregated by geographic region because this manner of disaggregation best depicts how the nature, amount, timing and uncertainty of revenue and cash flows are affected by economic factors. Refer to Note 13, Segment and Geographic Information, for additional detail.

Wayfair has three types of contractual liabilities: (i) cash collections from its customers prior to delivery of products purchased, which are initially recorded in unearned revenue, and are recognized as net revenue when the products are delivered, (ii) unredeemed gift cards and site credits, which are initially recorded in unearned revenue, and are recognized in the period they are redeemed, and (iii) membership rewards redeemable for future purchases, which are earned by customers on purchases made through the Credit Card Program, and are initially recorded in other current liabilities, and recognized as net revenue when redeemed. The portion of gift cards and store credits not expected to be redeemed are recognized as net revenue based on a pattern of historical redemptions, which are substantially within twenty-four months from the date of issuance.

4. Find the revenue recognition disclosures in the Management Discussion and Analysis section and in the Footnotes to the Financial Statements. Give examples of how the company recognizes its various types of revenues and explain how it this relates back to revenue recognition principle. 4. Find the revenue recognition disclosures in the Management Discussion and Analysis section and in the Footnotes to the Financial Statements. Give examples of how the company recognizes its various types of revenues and explain how it this relates back to revenue recognition principle