Most multi-channel resellers run three or four tools: one for orders, one for labels, one for stock, and a spreadsheet to find out what they actually made. Rilk is one system for all of it.
Orders from Amazon, Walmart, eBay, Shopify, WooCommerce, Etsy, Back Market, Newegg, Wayfair and Mirakl retailers such as Best Buy and Macy's come into one queue. You rate-shop and buy the label on the order, on your own UPS, FedEx or USPS account or on Rilk's negotiated UPS and FedEx rates, and tracking goes back to the channel. Amazon Buy Shipping and Walmart Buy Shipping are on the same screen.
On Pro, stock lives in one pool with warehouses, bins and serials behind it, and quantities push to each channel you switch on. Purchase orders, receiving, kits, returns and FBA/WFS inbound are built in. Payouts from Amazon, Walmart and eBay reconcile automatically; other channels reconcile by importing the retailer's file.
Start free: 500 orders a month, no credit card. Pro is $999 a month minimum.