Hi,
Please refer to this thread to learn about eBay add-on from CS-Cart team - eBay Synchronization add-on Beta testing - Upcoming features - CS-Cart Forums
POS system can be integrated as a custom solutions via the CS-Cart API or by creating a dedicated CS-Cart add-on. You can learn more about it here - http://docs.cs-cart.com/
Other points in question may require some custom development work that can be done by our certified customization partner - Simtech Development - http://www.simtechdev.com/
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certified customization partner - Simtech Development
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And the site says the “only certified cs-cart development partner”…
Hmm…