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The consequence of separating the web service (interface) module and the interaction (business) module is that you will need a data mapping between the two modules. Now that your BAAS is the service provider, the data mapping is the other way around as when you are the service requestor: Now the web service interface model is the source model, and the business model becomes the target model. Consequently, the forward mapping now translates the incoming request into understandable data for your business model, and the backward mapping transforms the resulting business data into a response that adheres to the interface contract. See also How to do a mapping.between the 

When you have the data mapping in place (and used by the Web service!), you can test if the BaaS works by calling it from SoapUI, as described in the visual Call to BAAS.

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