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Learn how Trello Power-Ups let you add custom validation logic using iframes, postMessage, and OAuth 2.0, with a worked example and practical checks.
Goal Migrate a small application's Trello board to a new workspace without downtime while preserving the card aging visual indicators that show how long cards have been inactive. Constraints and uncertainty Board export/import preserves card age metadata, but the UI display resets unless the aging Power-up is re-enabled in the destination workspace. The agin
trello
oauth