Google purchase approval assumed to cover all billing
Detection
The household policy names Family Link but not the payment system or store to which it applies.
Fix (technical)
Google states that Family Link purchase approval applies only to purchases made through Google Play’s billing system. Identify the relevant billing channel before relying on the control. [google-family-link-getting-started; google-play-child-account]
Fix (relational)
Make “which shop and which payment method?” part of the pre-purchase conversation.
Residual risk
Other payment routes require separate, provider-specific review.
Sources
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google-family-link-getting-started
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google-play-child-account