It's official! eBay's (NASDAQ:EBAY) PayPal has begun going live at over 2 million U.S. retail locations where Discover Cards are accepted. This is a pinnacle moment for the online payment processor that's trying to capture share in the tremendous point-of-sale market. Despite eBay's ambitions, there are many challenges for the company to overcome before investors can call this move a success. In this video, Motley Fool contributor Steve Heller examines how big of an opportunity this could be for PayPal and what factors will contribute to its success.

Erin Miller has no position in any stocks mentioned. Fool contributor Steve Heller owns shares of eBay. The Motley Fool recommends eBay and Visa. The Motley Fool owns shares of eBay and MasterCard. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.