# eCommerce development that sells — and connects to everything behind it > Custom and Shopify eCommerce development with payment, invoicing, inventory and ERP integrations, promotions and abandoned-cart recovery. Source: https://npcoding.ca/industries/e-commerce/ Online stores on Shopify or custom platforms, integrated with payments, automatic invoicing, inventory and ERP — designed to convert on every device. We don't just build online stores — we build shopping experiences that convert. Every store combines sales-focused design, a smooth purchase flow and precise technology: full mobile adaptation, payment processing, shipping and CRM integrations, and strong information security. Our eCommerce work spans mattresses sold in up to 12 instalments, personalized printed gifts with abandoned-cart recovery, 3D printing, home-design galleries and farm-fresh produce connected to the Priority ERP and weighing carts. ## Challenges in eCommerce - **Conversion:** Every extra step or slow page costs sales, especially on mobile. - **Back-office overhead:** Manual invoicing, stock updates and order entry don't scale. - **Repeat purchases:** Growth depends on promotions, loyalty and recovering abandoned carts. - **Protecting SEO:** Replatforming can wipe out years of search rankings if redirects are an afterthought. ## Solutions - **Stores designed to convert:** Fast, mobile-first product pages and a checkout with as few steps as possible. - **Payments & automatic invoicing:** Payment processing, instalments and invoices issued automatically on purchase. - **ERP & inventory integration:** Orders, stock and weights synchronized with systems like Priority. - **Promotions & recovery:** Promotions engines, members clubs, minimum-cart rules and abandoned-cart flows. ## How NPCoding delivers for eCommerce - **Development:** AI-assisted storefront and integration work: payments, invoicing, inventory and ERP connections. - **UI/UX:** Product discovery and checkout UX designed to convert on mobile, with promotions customers understand at a glance. - **QA:** Testing discounts, refunds, payment failures, instalments and inventory synchronization before every release. - **Operations:** Monitoring checkout errors, integration jobs and release performance, especially around sales and launches. How we build with AI: Store and integration work can be delivered with Claude Code and Codex, or in a private AI environment if customer data must stay on infrastructure you control. [Private / Local AI Engineering](https://npcoding.ca/services/private-ai-engineering/) · [Claude Code & Codex Engineering](https://npcoding.ca/services/claude-code-codex-engineering/) ## Related services - [Software & App Development](https://npcoding.ca/services/ai-software-engineering/) - [Enterprise Application Integration](https://npcoding.ca/services/enterprise-application-integration/) - [QA & Release Assurance](https://npcoding.ca/services/qa-testing/) - [DevOps & Managed Operations](https://npcoding.ca/services/devops-managed-operations/) ## Work in this industry - [Nature's Chef: a farm-to-door store wired into the Priority ERP and weighing carts](https://npcoding.ca/case-studies/natures-chef/): An eCommerce site for a third-generation fruit and vegetable farmer, connected to the Priority ERP and to weighing carts so the business knows exactly what was ordered, weighed and shipped. - [Sleep In: mattress eCommerce with payments in up to 12 instalments](https://npcoding.ca/portfolio/sleep-in/): An online store for a sleep-solutions company with 25 years of experience, selling mattresses from multiple brands with instalment payments, payment processing and automatic invoicing. - [SpeedPic: a rebuilt store for personalized printed gifts](https://npcoding.ca/portfolio/speedpic/): A rebuilt eCommerce site for SpeedPic, which prints personalized gifts — customers upload their own images and text, with promotions, a minimum cart value and abandoned-cart recovery built in. - [Icon Home Design: eCommerce for a home-design gallery](https://npcoding.ca/portfolio/icon-home-design/): An online store for a gallery specializing in home design and complementary furniture, fully responsive, with payment processing and automatic invoicing. - [Pri VeYerek: farm-direct produce eCommerce connected to the Priority ERP](https://npcoding.ca/portfolio/pri-veyerek/): An online store for a business that sells fruit and vegetables wholesale and retail, directly from the farmer — connected to the Priority ERP and weighing carts, with payment processing and automatic invoicing. - [Inventory & Sales: a stock and sales app for every small shop](https://npcoding.ca/portfolio/inventory-app/): An iOS and Android app for shops that keep stock on a shelf: barcode scanning, prices with and without VAT, stock-outs by reason, a pending list and reports. Built by NPCoding in 2026. - [Members Club plugin: loyalty and exclusive products for online stores](https://npcoding.ca/portfolio/members-club-plugin/): An NPCoding product: a plugin that lets store owners build a members club of loyal customers, create member-only promotions and dedicate products exclusively to members — no technical knowledge required. ## Frequently asked questions ### Shopify or a custom store? Shopify is fast to launch and easy to run for most retail catalogs. Custom or headless builds make sense for complex pricing, B2B rules or unusual integrations. We've delivered both and will recommend what fits your model. ### Can you connect our store to our ERP? Yes. We've connected stores to the Priority ERP — including weighing carts and automatic invoicing — so the business knows exactly what was ordered, weighed and shipped. ### Will we lose our Google rankings if we rebuild the store? Not if the migration is planned properly. We map every old URL to its new equivalent with 301 redirects, preserve metadata and structured data, and monitor Search Console after launch — exactly the brief we delivered for Dfus3D. --- NPCoding · AI-powered software & app development · Toronto, Canada · support@npcoding.com · https://npcoding.ca/contact/