Great module that easily solved our long lasting problem of all sales accounting channels.
We have been looking for a solution since 2015 and tried 4 other variants, but none of them seemed fitting. Either the prices are too high or none of the functions we needed.
The only one with functionality that we need and optimal price is Fairapi. We are using it for over a year for all of our sales channels such as: Amazon, eBay, Etsy, Shopify.