Guideline: Create Architectural Proof of Concept
This guideline describes how to select and validate an appropriate architectural proof of concept.
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Main Description

The proof-of-concept can have different forms, ranging from a conceptual diagram to an executable prototype. Its form and the approach you will be using to construct it are directly related to the objectives you defined for the proof-of-concept.

If the objective is to validate the integration with an external system you can develop a prototype to validate this integration on a meaningful transaction. If the objective is to validate the feasibility, perhaps searching documentation on previous successfull projects who used this approach would be enough.