Logo Giuseppe Guarino
Consultant & Developer
Giuseppe Guarino

Shopify Plus · B2B · Custom Development

Shopify Plus, B2B and custom app consulting for complex commercial rules

When an e-commerce business scales or launches a B2B channel, the bottlenecks are rarely visual—they sit in the commercial rules: customer-specific price lists, checkout customisation, tax validation, complex discounts, multi-market setups and ERP synchronisation. I help you decide when Shopify Plus is genuinely needed and build what does not come out of the box.

When does it make sense to move to Shopify Plus or build custom?

Basic, Grow and Advanced already include companies, B2B market catalogues and net payment terms. I assess Plus when you need catalogues assigned to individual companies, more catalogue assignments across B2B markets, deposits or partial payments, or extensions in the information, shipping and payment steps of checkout. I weigh those requirements against the plan cost and available alternatives.

What we can build on Shopify and Shopify Plus

  • B2B e-commerce portals on Shopify Plus (or blended B2B/B2C architectures): company profiles, multiple locations, custom price lists, minimum order rules, net payment terms and quick reorder flows
  • Checkout and cart logic customisation using Checkout UI Extensions and Shopify Functions (conditional discounts, shipping rules, VAT/tax ID validation, custom checkout fields)
  • Custom private Shopify apps and middleware in Node.js or PHP on AWS / Google Cloud when public App Store plugins cannot handle your business process
  • Multi-market and international architectures (Shopify Markets, multi-currency, multi-language, country-specific catalogues and distributed fulfilment)

How I approach Shopify Plus and B2B projects

Independent Shopify Plus evaluation

Before you commit to a 1-year or 3-year Shopify Plus contract, we review your requirements, licensing costs, transaction fees and what can be achieved on standard plans.

B2B and B2C data modelling

We design how products, variants, metafields, metaobjects, B2B catalogues and company permissions are structured so they remain maintainable and aligned with your ERP.

Clean, upgrade-safe extensions

I build on Shopify’s modern extensibility stack (Online Store 2.0, Checkout Extensibility, Shopify Functions, GraphQL Admin and Storefront APIs) rather than brittle theme hacks.

End-to-end back-office integration

I connect your B2B portal or international stores to your ERP, CRM, WMS and invoicing systems so orders, credit limits and inventory stay consistent.

What your business keeps

  • A documented cost/benefit analysis comparing standard Shopify, Shopify Plus and custom development
  • Complete B2B or multi-market architecture (data model, price lists, tax rules, order flows)
  • Production-ready Checkout UI Extensions, Shopify Functions and custom private apps
  • Integration between B2B/Plus workflows and your ERP or CRM
  • Staging environment, commercial edge-case testing and release plan
  • Source code, repositories, technical documentation and training for your internal team

Frequently asked questions about Shopify Plus, B2B and Custom Apps

Can we run a B2B store on Shopify without Shopify Plus?

Yes. Basic, Grow and Advanced support companies, B2B market catalogues and terms such as Net 30 or Net 60. These plans allow up to three catalogue assignments across active B2B markets. Plus removes that limit and also lets you assign catalogues directly to individual companies or company locations.

What are Shopify Functions and Checkout Extensibility?

Shopify Functions change rules such as discounts, shipping or cart validation. Standard plans can use Functions distributed through compatible public apps. A custom app that contains Functions requires Plus. Checkout UI Extensions add elements to checkout, with availability depending on the plan and where the extension appears.

Should we use a public App Store plugin or build a custom Shopify app?

If a public app solves the requirement cleanly at a fair monthly cost without slowing down the storefront, use it. Building a custom private app makes sense when you have proprietary business rules, need to connect with internal systems (ERP/WMS), or want to replace a fragile stack of overlapping third-party apps.

Do you also build Headless storefronts with the Storefront API?

Yes, including React / Next.js storefronts and React Native mobile apps, though I only recommend headless when there is a clear commercial reason. For most merchants, a well-engineered Online Store 2.0 theme delivers better ROI and lower maintenance.

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Shopify & Shopify Plus migration

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Shopify technical audit & performance

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Evaluating Shopify Plus, a B2B portal or a custom app?

In the first free call, we review your commercial and technical requirements to identify the right architecture without over-engineering the project.

Book a free call