Requirements

Functional Requirements:

• Allow users to send money or make payments to other users, merchants, or external accounts.
• Enable users to register accounts, log in, manage profiles, and link bank accounts or payment methods.
• Enable users to view past transactions, check balances, track payment status, and get receipts for completed transfers.
• Enable the system to detect and prevent fraudulent transactions in real time by analyzing transaction patterns, user behavior, and risk signals.

Non-Functional Requirements:

List the key non-functional requirements (eg low latency, scalability, reliability, etc.)...

API Design

Define the APIs expected from the system. This is your chance to analyze and define the read and write paths so that you can come up with the high-level design...

High-Level Design

Describe the overall system architecture. Identify the main components needed to solve the problem end-to-end. Use the diagramming tool to create a block diagram.

Detailed Component Design

Deep dive into 2-3 key components. Explain how they work, how they scale, discuss tradeoffs, capacity, and any relevant algorithms or data structures.