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.
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