According to PayPal historical shopping data, Mondays are the busiest online shopping days of the week during the holidays, with the official start of the holiday shopping season on the third Monday of October. In addition, the second Monday in December has historically been the busiest online shopping day, which it calls "Green Monday."

The online payment service revealed some of its holiday deals, and online shoppers can visit PayPal.com/holiday between November 3 and January 12 to receive up to 20 percent off, cash-back or free shipping from online retailers, including the following:

• Best Buy will offer $20 cash-back on purchases of 100 dollars or more when you pay with PayPal between November 10th and November 16th.
• Southwest Airlines, Omaha Steaks and Smart Bargains will offer up to 20 percent savings on all PayPal purchases.
• Walmart.com will offer free Site-to-Store shipping.
• Beauty.com will offer PayPal customers free shipping from November 3 - 9.
• Zappos.com will offer free shipping both ways on shoes and free overnight shipping on clothing from November 10 - 16.

PayPal also announced it is working with MicroPlace (also owned by eBay Inc.) to provide holiday shoppers with a unique gift that helps the world's working poor. Shoppers who purchase a gift certificate on MicroPlace.com will get a free $20 gift certificate to give to someone else on their list. These gift certificates will provide much needed capital to organizations that provide financial services to poor people around the world. This gift could help someone get access to a loan to start a business, generate income and work their way out of poverty.