Fintech Lab
Lesson 17Risk and operationsIntermediate
Promo credits and cashback
Where 'free' money comes from on your books.

You give a new user ₦500 of 'free' wallet credit as a signup bonus. Then you give them 2% cashback on a ₦1,000 purchase. The user sees free money. On YOUR books, that money came from somewhere, your marketing budget. 'Free' to the user is never free to your P&L, and engineers who book promos wrong hide their real customer acquisition cost.

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Fintech Lab is a free, interactive lab for fintech engineers. Real ledger, your own sandbox, engineering patterns from production. See all 85 lessons.

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