What are some alternatives?
When comparing Shopify Plus and USPS Informed Delivery, you can also consider the following products
BigCommerce - BigCommerce provides ecommerce software solutions and shopping cart software for online businesses. Try it free and start selling your products online today!
Amazon Logistics - Create your own delivery business. Amazon's UPS competitor.
Shopify - Shopify is a powerful ecommerce platform that includes everything you need to create an online store and sell online. Try it free for 14 days.
Jiffy - Delivering online shopping 6pm to midnight 🌙(LDN)
WooCommerce - A freely available eCommerce plugin that enables shop facilities on your WordPress website. Functionality enabling extensions & beautiful themes available.
FLEXE Next Day Delivery - eCommerce fulfillment network for next-day ground delivery