Does a service account is needed to create an integration object (used in process model ) and when service accounts are used?
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The service account has an API KEY associated with it to validate your request against Appian. When Appian receives the API KEY, it verifies that it belongs to a service account and the permissions related.
You don't have to use a service account in an integration, unless you are calling an appian web api.
IN case you are calling to another system, you need to ask fgor credentials to the owner (JWT Token, API key, Basic Auth.....)