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Free-to-play launches a game with virtual money so a player can try it before depositing. It uses the same launch endpoint with two parameters changed.
Do not confuse this with free rounds. Free-to-play is a demo with fake money and no wallet involvement. Free rounds are real money bonus rounds that do hit your wallet, with a stake of zero.

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Launching a demo

Set freeToPlay=true.
Omit currency — the session uses the virtual FUN currency automatically.
Omit token — there is no player session to authorize.
The response is a launch URL just like a real money session, opened the same way.

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What does not happen

No wallet callbacks

Your /player, /debit, /credit and /rollback endpoints are never called.

No transactions

Nothing is written to your ledger, and nothing needs reconciling.

No tracked bets

Demo bets are not recorded inside Zero-Dash and never appear in reporting.

No player identity

There is no accountId, because there is no authorization step.

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Availability

Not every game supports demo mode. Check freeToPlay on the game in List games and only render a demo button when it is true.
A demo launch for a game with freeToPlay: false is rejected. Filter on the catalogue rather than discovering it at click time.

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Real money and demo, side by side

Because a demo session has no player identity, it cannot be resumed and carries nothing across reloads. Present it as a try-out, not as gameplay to come back to.