Review and Fix Online Store Update

I need a developer to review a failed update to my online store and determine if it can be fixed. The store currently supports individual users only, and I need to add bulk buying and enterprise options for larger organizations. The product is a web-based training simulator, with pricing for 1-week or monthly access. For bulk purchases, I want the ability to create custom invoices instead of using a fixed price for all customers, as pricing varies by region. The store is built with NextJS/React and uses Stripe for payments. The previous update broke the store, and I need someone to review the existing repo and assess whether it can be salvaged.