How to Make a Shop System in Roblox (Currency + Dev Products)
Intermediate 11 min Economy & Data
A shop that handles both in-game currency purchases and real-money products with bulletproof ProcessReceipt.
Skip the typing
Generate the whole system, every file wired up. Free during beta.
How it works, step by step
- 1
Catalog lives in a shared config module: ids, prices, icons, grant handlers.
- 2
GUI renders from catalog; buy buttons fire PurchaseRequested{itemId}.
- 3
Server path A (soft currency): validate stock/funds, deduct, grant, echo receipt.
- 4
Server path B (Robux): MarketplaceService prompts; ProcessReceipt persists BEFORE granting, idempotently.
- 5
Log both paths for support disputes.
Concepts you'll use
- ProcessReceipt idempotency
- Config-driven catalogs
- Dual purchase paths
Mistakes that cost you players
- Granting items before persisting the receipt double-grants when Roblox retries.
- Prices stored client-side get edited by injectors; totals are always server math.
Every script above — written, placed & wired in ~30 seconds
Build it free 🔥no card · full access in beta
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