Successful business interactions in e-commerce need integration between service providers and service requestors based on mutual trust. Reputation is a form of trust in a social context. Formal reputation models currently do not fully meet the semantic integration needs in emerging Web Service Architectures. An integrating model for a Reputation Service is proposed to mediate in such electronic interactions. The model decouples the service requestor from provider and does not mandate any changes or strict rules of interaction. The model also offers solution to the semantic integration problem and is suitable to evolve with standards.