Font studio shop with testers and license tiers

We are a small independent font studio and we need a full-featured online shop where designers can find our typefaces, try them live, and buy exactly the license they need. Right now everything runs on email: someone writes that they need a web font, we send a price in PDF, manually issue an invoice, and mail files in an archive. This doesn't scale, looks amateurish next to competitor studios, and we lose sales simply because there's no self-service payment. We need a catalog where each family has its own page with all styles and weights, and an interactive tester where a visitor types their own text, adjusts size, tracking, and line height, and immediately sees how the typeface behaves. This preview is the heart of the shop; it must work smoothly and honestly.

The commercial part is a set of license tiers. A single purchase can combine a desktop license, a web license priced by monthly pageviews, and an app or embedding license, each with its own price based on seats or users. The cart must allow mixing styles and tiers in one order, automatically apply a family bundle discount, accept card payment, then deliver the needed files along with a personalized dated license certificate in PDF. After purchase, the customer needs a personal account with all orders, certificates, and download links, so they can re-download fonts, check what an old license actually covers, or upgrade the web tier as traffic grows.

We already have the fonts, sample images, and license texts; we're looking for someone to build the storefront, tester, multi-tier pricing engine, checkout, and license management dashboard, and make it all fast and reliable on desktop and mobile. What matters to us:
— live tester with arbitrary text, adjustable size, tracking, and features;
— flexible tiers (desktop, web by pageviews, app) in one cart;
— automatic file delivery and personalized license certificate;
— account for managing licenses, re-downloading, and upgrading.