Website Payment Guide Creation

I need a clear, step-by-step written guide that walks my users through every action involved in making payments or placing orders inside our web app. The document should begin the moment a user decides to check out and finish with the on-screen confirmation that their order is complete.

Along the way, please capture concise screenshots, label each step in plain English, and highlight any common pitfalls (for example, incomplete billing details, declined cards, or coupon code errors) with simple fixes. The tone must remain friendly and non-technical so first-time visitors feel comfortable following along.

Deliver the guide in two formats—an editable file (Google Docs or Word) and a polished, user-ready PDF. Before handing it over, double-check that each written instruction matches the current live flow of the app so I can publish the guide immediately without revisions.