Grokking the System Design Interview, Volume II
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Payment System: Database Schema

Step 5: Database Schema

These tables hold every merchant, customer, payment method, transaction, and money movement in the system. The diagram shows how they connect.

Merchants

Stores merchant, or business, account details. This table is small, so it can stay on one primary shard, a portion of the database that lives on its own machine. It can also be kept globally instead.

Field NameData TypeDescription

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