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Its problem type: https://developers.tassyir.io/errors/app-data-key-not-declared.

What to do

HTTP 400. Your installation’s version does not declare that key for that owner type. Declare it under [[data.definitions]], upload, and have the merchant accept the update.

Answered by

HTTP 400, from: The shape of every problem, and how @tassyir/app reports it: Errors.