XMPie uStore IMB barcode integration - AccuZIP alternates

[Chris Halt]

Hello everyone,
We use XMPie uStore web storefronts to offer VDP mail products online; postcards, etc..
AccuZIP integrates with uStore through an API to produce realtime postal IMBs.
Can anyone recommend alternates to AccuZIP that also integrate with XMPie uStore?
Thanks in advance…
Chris