Webservice Automation help required

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Visual-Studio

webservice

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I am trying to do a service based automation for product A , and validate that data is successfully inserted in C. A and C talk to each other VIA B.

1. A->B->C.
If some data is added to A, a event will be fired to B which would update the data in C database.

I am trying to create service based automation for the project. Which would write data to Project A using service and it would trigger a notification on B which would update the database of C, then i have to validate that data inserted in C was the one i have inserted from project A.

A is only exposing get method. Project C is only updated when A notifies via events to B that a event has occurred at A.Manually entering data in A(database) wont trigger the events.

What would be the best approach to implement the automation(service based).

Product A and C cannot directly talk to each other they interact via B.

What would be the best way to implement service based automation for it? Which tool Soap UI /Visual studio is based for the job?