i too was looking for integration with EPOSNOW but no longer have any physical retail
but now with the linnworks API someone could create the middleware in the form of a linnworks connector
i think the CEO of linnworks was getting fed up with so many requests to integrate with this marketplace/shipper/accounts package/epos that they finally gave in and produced an API. so that any developer could do the integrations which were not cost effective for linnworks and let linnworks work on the more important integrations.
so now all we need to do is a) all interested linnworks customers get together to share the cost of such an integration or b) some clever and smart linnworks partner to produce an linnworks connector
what about mypos.co.uk - they appear to offer a linnworks 'integration' on their webpage at http://www.mypos.co.uk/services/systems-integration. Maybe someone with more experience in POS can assist as we are relatively new to this...