Mockbit/#112
SYSTEM_DESIGNmediumSystem design~25m

Payment Processor

Problem

Design a payment processing system (durability, exactly-once semantics, PCI constraints).

Reference solution

Reference solution available after you attempt the question.

Ready to solve it?

Start a session on Mockbit #112. You'll get graded with specific critique when you submit.

Related SYSTEM_DESIGN questions
← Back homemockbit.io/q/112
PrivacyTerms© 2026 Mockbit