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Shopify Plus Agency

A Shopify Plus agency designs, builds, migrates and grows stores on Shopify Plus, the plan Shopify built for high volume, B2B and multi store businesses. Ecomzier is a Shopify Plus Expert agency: our Shopify Plus experts handle migrations, checkout extensions, custom Shopify Functions, B2B, integrations and conversion work, so the features you pay for on Plus actually get used.

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1,100+ Shopify stores built, $500M+ in client revenue, 11 eCommerce awards and 400+ five star reviews.

What is a Shopify Plus agency?

A Shopify Plus agency is a team of Shopify specialists that delivers the projects a Shopify Plus store needs: replatforming, storefront builds, checkout customization, custom apps, B2B and integrations with the rest of your business systems. The plan itself only unlocks features. Shopify lists them on its Shopify Plus plan page, and someone still has to configure, build and test each one.

Shopify also points Plus merchants to service partners. Its Partner Directory lets you filter partners by service and by tier, and check reviews and work samples before you hire. When you compare Shopify Plus partners, look for proven Plus projects in your business model, not just a badge.

What does a Shopify Plus agency actually do?

Good Shopify Plus experts work across strategy, engineering and operations. On a typical engagement, Ecomzier owns these jobs:

Plus fit and solution design

We review your catalog, checkout, B2B, markets, apps and integrations, then write a solution design that maps each requirement to a Shopify feature, an app, a custom app or a Function.

Build and engineering

Theme and storefront development, checkout UI extensions, custom apps and Shopify Functions, written and version controlled for your store only.

Data and integrations

Migrating products, customers and orders, and connecting Shopify to ERP, PIM, OMS, 3PL and marketing systems so data flows without manual work.

Plus feature setup

Organization admin, users and permissions, expansion stores, B2B companies and catalogs, Launchpad events and Shopify Flow automations.

Testing and launch

Test plans with your team, real orders through every payment and shipping path, redirects for every old URL and a monitored launch.

Growth after launch

Conversion rate optimization, SEO, speed work and new features shipped on a roadmap, so the store keeps improving after go live.

Our Shopify Plus services

Every service below is delivered by the same Shopify Plus team, so migration, build, checkout and integrations are planned together instead of handed between vendors.

Shopify Plus migration

Move from Magento, Adobe Commerce, Salesforce Commerce Cloud, BigCommerce, WooCommerce or a custom platform with products, customers, orders and SEO intact. Shopify migration services

Shopify Plus development

New Shopify Plus stores and storefront rebuilds on Online Store 2.0 themes, built for speed and easy editing by your team. Build a new Shopify store

Shopify Plus B2B

Companies and locations, catalogs assigned to a company, volume pricing, payment terms, deposits and partial payments, on the same store as your DTC channel. Upgrade to Shopify Plus

Checkout Extensibility

Checkout UI extensions, branding and Functions for the information, shipping and payment steps, rebuilt from old checkout customizations. Checkout Extensibility upgrade

Custom apps and Shopify Functions

Custom apps with your own discount, delivery, payment and cart validation logic when no public app fits. Shopify app development

Integrations

ERP, PIM, OMS, 3PL and CRM connections built to use the higher Plus API limits, with error handling and monitoring. Shopify app integration

Conversion rate optimization

Research, analytics and A/B testing on product pages, cart and checkout to grow revenue from the traffic you already have. Conversion rate optimization

Who we work with

Our Shopify Plus clients are usually businesses where complexity, not traffic alone, is the reason to be on Plus:

High volume DTC brands

Brands that need checkout customization, scheduled launches and drops, and an API budget large enough for real time inventory and order sync.

B2B wholesalers and distributors

Businesses selling to companies with their own catalogs, price lists, quantity rules and payment terms, often next to a DTC storefront.

Manufacturers selling direct

Manufacturers adding a direct channel on top of dealer or wholesale sales, with ERP as the source of truth for products, stock and pricing.

Enterprise replatforming teams

Retailers leaving Magento, Adobe Commerce, Salesforce Commerce Cloud or a custom build who want lower platform maintenance without losing features.

International sellers

Brands selling across countries, currencies and languages with Shopify Markets, or with expansion stores in one organization.

Shopify brands outgrowing Advanced

Teams that need more staff accounts, more locations, B2B features or custom Functions than the Advanced plan allows.

Shopify Plus vs Shopify: what changes on Plus

Shopify Plus runs on the same platform as Basic, Grow and Advanced, with higher limits and enterprise features. Every row is checked against Shopify's own pages, linked in the sources below. Plan fees vary by region, so see Shopify pricing and Shopify Plus pricing for current numbers.

AreaShopify (Basic, Grow, Advanced)Shopify Plus
CheckoutApps can extend the Thank you and Order status pages (Shopify Help Center).Apps and extensions can also customize the information, shipping and payment pages, and the Checkout Branding API is available.
Custom logicShopify Functions only through public App Store apps (Shopify developer docs).Your own custom apps that contain Shopify Functions.
B2B catalogsUp to 3 active catalogs across all B2B markets (Shopify Help Center).Unlimited, including catalogs assigned directly to a company or location.
B2B paymentsNet payment terms and payment reminders.Adds deposits, partial payments and payment requests per fulfillment.
StoresOne store per plan.A primary store plus 9 expansion stores under one organization and contract (Shopify Help Center).
Organization adminNot available.Manage multiple stores, users and billing in one place (Shopify Help Center).
Staff accountsNone on Basic, up to 5 on Grow, up to 15 on Advanced (Shopify pricing).Unlimited.
Inventory locations10.200.
GraphQL Admin API rate100 points per second, 200 on Advanced (Shopify developer docs).1,000 points per second.
LaunchpadNot available.Schedule sales, product drops and restocks (Shopify Help Center).
Shopify FlowFree on Basic, Grow and Advanced (Shopify Help Center).Also free, and adds tasks created by custom partner apps.
URL redirectsUp to 100,000 (Shopify Help Center).Up to 20,000,000.
Pricing basisMonthly plans, see Shopify pricing.A monthly fee on a 1 or 3 year term, or a variable platform fee for more complex business structures, see Shopify Plus pricing.

Sources: Shopify Plus plan, Shopify pricing, Shopify Plus pricing, checkout customization, Shopify Functions, B2B plan features, expansion stores, organization settings, API rate limits, Launchpad, Shopify Flow, URL redirects. Checked October 2026.

How we deliver Shopify Plus projects

Six steps from first call to a store that keeps improving after launch.

  1. Step 01

    Discovery

    We map your goals, catalog, checkout, B2B, markets, apps and integrations, and agree on what success looks like.

  2. Step 02

    Solution design

    Each requirement is mapped to a Shopify feature, app, custom app or Function, with a written scope and plan you approve.

  3. Step 03

    Design and build

    Theme, checkout extensions, Functions and custom apps are built in a development store and reviewed with your team.

  4. Step 04

    Data and integrations

    We migrate data, connect ERP, PIM, OMS and 3PL systems, and set up Plus features such as B2B and expansion stores.

  5. Step 05

    Testing and launch

    Real orders through every path, redirects for every old URL, then a monitored launch with your team on hand.

  6. Step 06

    Optimize and grow

    After launch we track performance and ship CRO, SEO and new features on a shared roadmap.

Why brands choose Ecomzier as their Shopify Plus agency

Ecomzier is a Shopify Plus Expert agency focused on Shopify Plus migrations, development, B2B and integrations.

1,100+

Shopify stores built

$500M+

Client revenue generated

11

eCommerce awards

400+

Five star reviews

Shopify Plus case studies

  • Hardware distributor, USA

    X Cart Shopify Plus

    70,000+ SKUs

    Timeline:
    12 weeks
    Read the case study

  • Dash cam and vehicle electronics retailer, North America

    Shopify Basic Shopify Plus

    +86% conversions

    Timeline:
    6 to 8 weeks
    Read the case study

  • Athletic gear brand, million dollar business, USA

    Shopify Basic Shopify Plus

    +78% conversions

    Timeline:
    12 weeks
    Read the case study

Ecomzier LLC played a pivotal role in transforming [our business] by migrating our platform from Shopify Basic to Shopify Plus. Their expertise in implementing custom B2B features and integration solutions significantly enhanced our operations. We saw a 78% increase in conversions and a 35% rise in repeat customers.

Owner, athletic gear brand

Shopify Plus agency FAQ

What does a Shopify Plus agency do?

A Shopify Plus agency plans, builds and grows stores on Shopify Plus. That covers migrations from other platforms, theme and storefront development, checkout customization, custom apps and Shopify Functions, B2B setup, integrations with ERP, PIM and OMS systems, and ongoing conversion and SEO work.

What is a Shopify Plus Expert agency?

It is an agency whose team specializes in Shopify Plus projects rather than general web work. Ecomzier is a Shopify Plus Expert agency. Shopify's Partner Directory also tiers service partners on experience and proven success on Shopify, and shows reviews and work samples, so you can compare Shopify Plus partners before you hire.

Do I need a Shopify Plus partner, or can my team do it in house?

Many Plus features are configured in the admin, so an in house team can handle a lot. You usually need Shopify Plus experts for checkout extensions, custom apps with Shopify Functions, which only Plus stores can use (Shopify developer docs), complex B2B, data migration and system integrations.

How much does Shopify Plus cost?

Shopify publishes Plus pricing on its Shopify Plus pricing page. Standard businesses pay a monthly fee on a 1 or 3 year term, and more complex business structures pay a variable platform fee instead. Prices vary by region, so check the page for your market.

How much does a Shopify Plus agency cost?

It depends on scope: a checkout upgrade, a B2B setup and a full replatforming are very different projects. We do not publish fixed prices. After a free consultation you get a written scope and a fixed quote for your project.

What can be customized in checkout on Shopify Plus?

On Plus, apps and checkout UI extensions can customize the information, shipping and payment pages, and the Checkout Branding API is available. Other plans can extend the Thank you and Order status pages only (Shopify Help Center). Custom checkout logic runs as Shopify Functions.

Is B2B only available on Shopify Plus?

No. Companies, catalogs, net payment terms and self serve ordering work on every plan, with up to 3 active catalogs. Plus adds unlimited catalogs, catalogs assigned directly to companies and locations, deposits, partial payments and payment requests per fulfillment (Shopify Help Center).

How many stores can we run on Shopify Plus?

Shopify Plus includes a primary store plus 9 expansion stores under the same organization and contract, managed together in the organization admin. Expansion stores must be extensions of the main brand, for example for other countries or wholesale (Shopify Help Center).

Can you migrate us to Shopify Plus from another platform?

Yes. We migrate stores from Magento and Adobe Commerce, Salesforce Commerce Cloud, BigCommerce, WooCommerce and custom platforms, including products, customers, orders, content and a 301 redirect for every old URL. Already on Shopify? See upgrading to Shopify Plus.

Talk to our Shopify Plus experts

Ecomzier has built 1,100+ Shopify stores that have generated $500M+ in client revenue, backed by 11 eCommerce awards and 400+ five star reviews. Book a free consultation and leave with a clear plan for your Shopify Plus project.
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