Adobe Inc on Wednesday said it will add payment services to its e-commerce platform this year to help merchants accept credit cards and other ways of paying, deepening a rivalry with e-commerce firm Shopify Inc. Adobe started providing software to help retailers run their online stores in 2018 when it purchased Magento Commerce from private equity firm Permira for $1.68 billion. Adobe will roll out the new payment system by the end of this year in the United States and is tapping PayPal Holdings to process a variety of payment types, including credit and debit cards as well as PayPal’s own payment and pay-later offerings. Until now, Adobe’s e-commerce customers have had to build their own payment systems. That works for larger businesses that can negotiate with payment processors, but Adobe wanted a simpler service for smaller merchants, Peter Sheldon, senior director of commerce strategy at Adobe, told Reuters in …