According to those familiar with Twitter's plans, start-up company Stripe will be involved in the payment processing end of things. Companies interested in this plan are being told to first sign up with Stripe to process orders. For now, the company is Twitter's lone partner in the project.
While there had been some rumblings of a plan that would enable Twitter to collect on the growing trend to use social media as a sales tool, it wasn't until former Ticketmaster CEO Nathan Hubbard took over at Twitter, that the popular service was seen accommodating e-commerce. The "buy now" buttons first started appearing in June, with word that an official launch would take place before this year's holiday shopping season is to begin.
source: Recode via Gizmodo