No Coding? No Problem! Start Your IT Career as a Database Administrator with Learnomate

Microsoft Azure Database Administrator Full Course 2026 [FREE] | Azure AZ-104 Course | Simplilearn

S-Line Filter: Edit Database

System Design: Building a Bulletproof Payment Gateway! 🚀 Basic payment setups fail during network timeouts. To block catastrophic duplicate charges, enforce client-generated idempotency keys (UUIDs). The server saves this key first; if a duplicate request arrives, it immediately returns the cached result instead of re-charging the buyer. Never overwrite database rows to update payment statuses. Instead, implement an immutable ledger where every state change—authorized, captured, or refunded—cre