My application needs to communicate with an external system, proably to propagate the transaction context. But how the external system is exposed is not been told. As a matter of fact, this external system is not explicitly given. However it is mandatory one for the given problem. How do we go about this problem. And an another question , how do we address the peroformance of database retrieval in our design especially when we do not design the schema.
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For the external system, you can list your assumptions as to how you will communicate. If you can't control the external system, you can't propagate a transaction there though. Similarly, you wouldn't be communicating directly with the database of the external system. They should be providing an API to get at the info.