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Multi-Field External Validation in Custom External Adapters

Custom External Adapters can now validate multiple Data Group fields in a single external call, and validation is enforced consistently across both the journey UI and API updates — ensuring data quality rules are applied whether fields are entered manually or submitted programmatically.

Previously, external validation applied only when users updated Data Group fields through the journey UI. Validation is now also enforced when Data Groups are updated programmatically — including through data migrations, ETL processes, and API integrations. Existing adapter configuration does not need to change; the broader enforcement is applied automatically.

User Guide Reference: Configuring Journeys — Multi-Field External Validation in Custom External Adapters