Hi Geoff,We recently helped a big Australian brand to resolve a similar issue after customising their integration. Unfortunately most integrations will take SKU as a common identifier but by customisation you can use other fields like SKU 2, Supplier...

Hi Lawson, We have done multiple integrations of Acumatica with Shopify POS and Website. Kindly visit https://www.saasintegrator.com/shopify-integrate-acumatica/ and enquire if you need any help. Thanks!