What are some alternatives?
Swiftype Site Search - Swiftype Site Search helps to sell more, get the right answer to more people on the platform and surface relevant content for readers and followers.
PayPal - PayPal is the faster, safer way to pay online without sharing financial details, send and receive money or accept credit and debit cards as a seller
Easyship - Easyship, the #1 global cloud-based shipping software, is a technology platform that helps eCommerce merchants ship worldwide.
Stripe Connect - The payments platform for platforms
Cart2Cart - Cart2Cart is an automated shopping cart migration service.
Authorize.net - Payment gateway enables internet merchants to accept online payments via credit card and e-check.