Keep free play previews separate from purchase authorization
The practical problem
A free browser-game preview and a paid download might share a page, tempting developers to gate downloads with JavaScript booleans.
Implementation protocol
Let previews run publicly, but require payment verification, order ownership and server-side entitlement before sending a purchased file.
Worked scenario
Editing localStorage from paid=false to paid=true must not let a visitor download an order they did not purchase.
What could go wrong
A success animation after sending a wallet transaction is not verified settlement.
Acceptance criteria
Test replay attacks, failed purchases and refunded orders in a nonproduction environment.
Source material and evidence boundaries
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