Antiquarian bookshop looking for a merchandise management system with price optimization

We run a classic and modern antiquarian bookshop and are looking for a merchandise management system with price optimization.

The software should do or support the following:

• stock maintenance
• comparison of stock on all platforms
• feeds to all platforms (at least: Amazon in various countries, also USA and Japan, Ebay ..., Abebooks/ZVAB, booklooker, Hitmeister, possibly Buchfreund etc.) and on the homepage
• create invoices and print them out appropriately
• stock compartment management
• filter options for all attributes
• recognition of multiple entries with the same ISBN, translation from ISBN to article number (both the internal article no. and the platform-related article no.) etc.

Further requirements are

• interfaces with bank, PayPal and Abebooks for payments
• cataloging with VLB data, Amazon and German National Library
• cataloging also via ISBN lists with supplier identification
• orders that come in via the platforms must be exportable so that we can assign them to our respective supplier
• interface to the parcel service provider
• and: Feedback if cataloged items are not online on any platform; if possible, with the reason.

The software should run on approx. 6 workstations.