High-Level Designs

High-Level Design documents for Wallet Convenient Checkout features. Each HLD is written for a broad audience — product owners, engineers, QA, and API consumers.

📄️High-Level Designs

This section contains High-Level Design (HLD) documents for major features within Wallet — Convenient Checkout.

📄️Split Tender Refunds

High-Level Design for processing refunds on Split Tender (multi-payment-method) transactions

📄️HSA-Tagged Payment Methods

High-Level Design for the Optum Bank HSA card tag on Wallet payment methods and the single-tag-per-wallet invariant that enforces it