tiennm99 f3aaf16d6a feat: simplify topup to VND-only, add bid/ask spread to convert ...

Topup now only accepts VND — users must convert to get other currencies.
Convert uses a 0.5% bid/ask spread: buying USD costs more VND (ask),
selling USD back gives less VND (bid). Simulates real forex behavior.

2026-04-14 16:06:36 +07:00

7.3 KiB

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