CASE STUDY · MUSIC E-COMMERCE
CartyHarp brings instruments, handmade retail, books, and sheet music into one iOS and Android shopping experience—physical harps ship by courier, PDF scores and MP4 lessons deliver by email, so vertical music retail actually runs as a product.
WHY IT WAS NEEDED
Many niche music retailers already have strong catalogs. What they lack is a platform that holds physical instruments, DIY kits, method books, and digital sheet music in one product and order model. When each type lives in a different channel or spreadsheet, buyers switch contexts and operators cannot filter, sell, or fulfill consistently.
Split catalog
Harps, lyres, DIY kits, European method books, and PDF scores often sit on different pages or third-party links. Without a unified directory under Store, Handmade, Books, and Scores, search and filters cannot reuse the same logic across categories.
Without one front door, “one-stop music shopping” never becomes a credible buyer experience.
Mixed fulfillment
Physical instruments need shipping addresses and tracking. PDF scores and MP4 courses need download links sent after payment. If the order model supports only one fulfillment mode, buyers split checkout and staff manually send digital files.
Fulfillment stays disconnected, so a mixed cart cannot feel seamless at checkout.
Broken loop
Without product detail, cart, coupons, address and email validation, payment callbacks, and order states wired together, buyers pay offline or through support. Search ranking, favorites, and after-sales never become operable data.
Until the main loop runs, category breadth does not translate into repeatable online revenue.
The client did not need a feature checklist app. They needed a music commerce platform that carries four product families, two fulfillment modes, and keeps working as SKUs grow.
OUR APPROACH
Instead of building screens from a requirements table, we designed around one loop: unified catalog → filter and search → cart and checkout → payment routing → mixed fulfillment → order tracking.
SOLUTION
For vertical music commerce, we split capabilities into five modules that stand alone and work together.
IS THIS YOU?
Teams selling instruments, craft goods, books, and digital content often hit the same walls.
HOW IT WORKS
This is how a real music commerce purchase runs through the system—not a UI feature list.
TECHNOLOGY
UniApp ships iOS and Android from one codebase. Backend services cover catalog, orders, payments, and fulfillment through a unified product model that supports physical and digital SKUs in the same checkout.
Architecture
UniApp client + REST API + catalog/order services + Stripe / WeChat / Alipay + email and logistics
UniApp · iOS / Android · Home / categories / search / detail / cart · Checkout / pay / profile
Four-category catalog and attributes · Mixed SKU cart and orders · Payment callbacks and fulfillment routing · Address / email / after-sales states
Stripe international payments · WeChat Pay · Alipay · Email delivery (PDF / MP4) · Courier status callbacks
Products / categories / inventory · Orders / payments / fulfillment logs · Favorites and address book
Keywords
OUTCOMES
Outcomes the client can observe after delivery (no unauthorized commercial figures).
REUSABLE PATTERN
Unified catalog + mixed SKU + payment routing + dual fulfillment fits many niche retail and content businesses—run browse-to-delivery first, then expand categories and operations.
Harps / lyres, cases and stands, origin filters, courier fulfillment
DIY kits, custom parts, material and tool SKUs
Print / PDF methods, theory titles, email delivery and stock flags
Digital scores, MP4 lessons, auto link after payment
Multi-category catalog, mixed cart, Stripe plus local payments
Talk about your product
If you are planning an instrument store, vertical marketplace, or physical-plus-digital catalog, the first decisions are usually not which tab to design—they are how SKUs are modeled, how mixed lines checkout, how fulfillment splits after payment, and how order status stays visible to buyers.
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