The app complements Square's overall suite of small business services, especially for its customers that operate a mostly mobile business.
Storefront will feature a curated selection of more than one million products from nearly 20,000 US-based small businesses.
The aim is to make it easier and faster to search for attachments and links across multiple senders in an email thread.
The company has also teamed up with Square Capital for seller financing.
The company also announced that it's raised $50 million in new venture capital from Silicon Valley investors, including PayPal cofounders Peter Thiel and Max Levchin.
The Brooklyn-based crafts vendor expects the fee hike to provide a substantial boost to its revenue.
The Interests feature aims to show shoppers products that are individualized to their preferences.
The platform leverages technology from Square's Caviar delivery business, resulting in a combined first-party ordering platform and point of sale.
The deal marks Square's second acquisition in a week's time following its purchase of the catering platform Zesty.
eBay said the update taps into its collection of structured data to pre-populate an entire listing with just an item name or scanned barcode.
IDC expects SMBs to spend the most on devices, including personal computing devices, peripherals, and mobile phones.
The program offers co-branded graphics for store windows, and additional support and promotion from eBay to drive online traffic.
The aim is to make it easier on the backend for small businesses to set up Automated Clearing House (ACH) bank transfers with Stripe.
Facebook revealed that it's investing heavily in small businesses as a way to grow its business in Europe and the US.
The company said Akamai's image optimization technology will help online sellers avoid slow-loading pages due to outsized, high-resolution images.