Software as a service (SaaS) services featuring software for facilitating one-click popups and opt-in functionality for e-commerce websites; providing temporary use of online non-downloadable software for collecting customer information and consent through website popups and widgets; software as a service (SaaS) featuring technology for pre-filling user data and automating subscriber opt-in flows for e-commerce stores; providing temporary use of online non-downloadable software for increasing list growth, marketing opt-in, conversion, and automated customer engagement; design and development of computer software for marketing automation, subscriber acquisition, and customer engagement; software that integrates with marketing automation platforms to provide branded popups and widgets on merchant websites.