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CONNECT facilitate custom overrides for an exchange partner. You can define them in exchangeInfo.xml. Refer to /wiki/spaces/CONNECTWIKI/pages/544899100
How do I initiate exchange directory download?
CONNECT can download from web services registry from both UDDI and FHIR directroies. You can configure the download in exchangeInfo.xml. For more information see /wiki/spaces/CONNECTWIKI/pages/278528020 and Sample exchangeInfo