Stripe Inc., the online-payments processor, unveiled a tool called Relay to simplify mobile e-commerce for stores and software applications developers. Twitter said it's adopting Stripe's offering to make it easier to buy products from a link in a tweet. InMobi, a mobile-advertising company, and SAP SE's e-commerce software unit Hybris also said they are integrating their services with the San Francisco-based startup's product.

Stripe doesn't work directly with consumers. Instead, it builds tools to make it easier for other companies to sell products online. The payments company's new Relay product functions as a universal sell button for retailers, allowing companies to list products in a single place and sell them directly on Twitter as well as other e-commerce platforms like ShopStyle.

Twitter outage

Seperately, Twitter.com was unavailable on Monday for some users across the United States.

Twitter users and others said they received a message that read "something is technically wrong" when trying to open the Twitter website on their personal computers.

Update: Twitter.com was restored around 3:15 p.m. EDT, Twitter said.

Twitter said users experienced problems accessing the service between 2:22 p.m. to 3:16 p.m. EDT, but the mobile app and Tweetdeck, which allows users to view multiple Twitter browsers at once, were unaffected.