Hello Bal,
If you are using the standard SOAP connector of Boomi, I think this is the way to go.
However I am not used to the Financial data web services so I cannot tell you how you can import them into Boomi.
The main obstacle you might encounter is to find all the relevant data you need in web services as query web services do not cover everything in the financial modules.
Make sure to integrate all the web services you need in your communication scenario you will use: the query ones, the manage as well as the action (if some action web service is available for the corresponding object). This will allow you to access all the web services with the same authentication.
To be noticed, the Cloud for Customer specific connector in Boomi also works with ByDesign. So all the objects that are in both systems, likle Contacts, Accounts, Campaigns, etc. are working with SAP Business ByDesign. Thus you can use the specific connector for them.
However, there are no Financial web services currently in this connector.
I am working with the Dell Boomi team in order to enhance the connector of C4C with objects of ByDesign. I will keep you in touch if some financial services are added (not in scope for now).
Thank you for your attention.
Good luck with your integration project.
Best regards.,
Jacques-Antoine Ollier