Providing temporary use of online non-downloadable computer programs for processing electronic payments, creating, distributing, and managing virtual payment cards and card transactions and tax calculation and collection; User authentication services using technology for e-commerce transactions; Providing temporary use of non-downloadable computer software for e-commerce merchants to track and manage their businesses transactions and customer data in the field of business and eCommerce; electronic data storage; Design and development of computer software for accepting purchases from within mobile apps and software that perform other non-purchasing functions; Application service provider featuring application programming interface (API) software for integrating eCommerce, business, transactional, financial, and analytics information and functionality into other software and platforms; Authentication in the field of financial transactions, namely, providing user authentication using technology for electronic funds transfer, credit and debit card and electronic check transactions via a global computer network; Computer services, namely, integration of computer software into multiple systems, including for processing payment transactions; Providing temporary use of online non-downloadable software development tools; Providing temporary use of non-downloadable software for configuring credit and debit card readers; Providing temporary use of non-downloadable software for managing, reporting, and reconciling payment transactions made online and offline; Providing temporary use of non-downloadable software for configuring mobile and web applications to accept electronic payments; Providing temporary use of non-downloadable software for allowing third-party sellers to accept electronic payments