The authentication of existing EPC Information Service (EPCIS) platforms depends on individual authentication implementations of each EPCIS administration- this approach is not scalable and cannot fully meet the requirements of supply chain management. This paper extends OpenID authentication mechanism by sharing user attributes between identity providers and Relying Party (EPCIS in this application), and integrates the extended OpenID with EPCISs. This integrated platform allows a user with only one single OpenID account to access EPCISs of different domains around the globe, and each EPCIS can authorize applicable access rights to the users, based on the local policy and the user's attributes delivered from Identity Provider. This solution provides a scalable, effective and integrated authentication mechanism for EPCIS supplies chain management.