Google has corrected a typo in the BudgetPerDayMinimumErrorDetails message.
- Wrong field:
minimum_bugdet_amount_micros(typo). - Correct field:
minimum_budget_amount_micros. - The fix applies retroactively to V21 starting October 15, 2025 (the same day V22 releases).

What to do:
- If using the official client libraries: No break, but update code when upgrading libraries.
- If using REST API: Update your code to reference the corrected field name.
Read the full update here: Correction of an error in the BudgetPerDayMinimumErrorDetails message.