Build and operate online stores with payment security, inventory management, marketplace integration, and conversion optimization.
| Topic | File |
|---|---|
| Code traps that break production | code-traps.md |
| Platform comparison (costs, features) | platforms.md |
| Operations (stock, shipping, returns) | operations.md |
| Growth (CRO, upsells, LTV, benchmarks) | growth.md |
These break production and cost real money. See code-traps.md for full patterns.
payment_intent_id, check before processing. Webhooks retry.UPDATE ... WHERE stock > 0 with rowsAffected check, not read-then-write.stripe-signature or equivalent. Reject unsigned requests.For Spain-specific costs (IVA, OSS, carriers), see platforms.md.
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