10 Best Ecommerce Agencies for Shopify POS and ERP Integrations in 2026

Picture a normal Tuesday in a retail business. A customer buys the last unit of a product in the store, and the website keeps selling it for another hour. Someone returns an online order at the counter, and finance spends the afternoon figuring out where the refund should land. A sales associate flips between three screens just to confirm a price.

These problems arise when sales channels, inventory records and back-office systems fall out of sync. A well-planned integration helps keep those records aligned.

Shopify POS ties in-person selling to your online store. The ERP handles broader operations such as finance, purchasing and inventory planning. Getting them to work together comes down to a few important decisions: which system controls each record, and how orders, stock movements and returns travel between them.

That takes an agency comfortable in three areas at once: retail rollouts, integration development and the day-to-day reality of running a store. The ten below cover that ground in different ways.

How These Agencies Were Selected

These ten agencies bring expertise in Shopify POS, systems integration and ecommerce development. The list covers multi-store rollouts, custom retail workflows, ERP connectivity and wholesale purchasing, with each profile highlighting a different operational focus.

At a Glance

1. Fyresite

Best for: Retailers connecting Shopify POS with their online store and existing business systems.

Fyresite handles Shopify POS implementation, including hardware, inventory and location setup, staff training, multi-store rollouts and support after launch. It also integrates Shopify with ERP, CRM, warehouse management, tax and shipping systems, with integration experience including NetSuite and Epicor.

The part that matters most in these projects is how orders, returns and inventory move between Shopify and the systems behind it. Fyresite defines synchronization patterns around the business’s operating requirements, including the timing and direction of data transfers.

That is useful when replacing an old POS while keeping an established ERP. Store configuration, product data and integration testing have to progress together so staff can complete sales using accurate information.

Fyresite also supports companies selling both wholesale and directly to consumers, making it relevant to projects involving physical stores and account-based online ordering.

2. CQL

Best for: Enterprise retailers needing a rollout partner and ongoing POS support.

CQL covers Shopify POS migration, implementation, customization, consulting and support, alongside workflow mapping, staff onboarding and omnichannel planning. It also provides ERP, order management and product information management integrations.

A distinguishing service is Enterprise Retail Care, its managed support offering for Shopify POS hardware and software. CQL coordinates with Shopify, ERP and integration-platform vendors and tests custom POS extensions against new releases.

That support becomes particularly important when a card reader or an extension fails during a busy trading period. Across a large store network, knowing who owns the problem and how to escalate it is part of running the system effectively.

CQL’s offering addresses both the initial rollout and the ongoing work required to keep retail locations operating consistently.

3. Sunrise Integration

Best for: Businesses needing custom POS connections and hands-on technical work.

Sunrise Integration provides Shopify POS configuration, installation, training, custom integration and ongoing support. It extends in-store workflows through apps and custom development for areas such as discounts, loyalty and pickup, and connects POS with outside services including ERP and CRM platforms.

Its API-focused approach is relevant when a sale needs to trigger an action elsewhere or pull external account information into the purchasing process.

The implementation needs to establish what happens inside POS and what the connected system handles. That includes the information exchanged, the sequence of actions and the response when a connection fails.

Pairing development with staff training helps turn custom functionality into something employees can use confidently during everyday transactions.

4. SDG

Best for: Showrooms and retailers with specialized selling workflows.

SDG builds Shopify POS implementations and custom extensions for quoting, product configuration, special pricing, printed documents and associate workflows. It also connects Shopify with order management, inventory and ERP systems.

Its Blu Dot project provides a specific example: trade pricing, NET30 terms, freight-aware checkout and PDF quotes generated from the showroom floor, all delivered through a tailored setup.

That experience is relevant to furniture, design and other categories where a sale begins with consultation and involves later delivery.

The question to ask SDG, or any custom developer, is how closely the POS needs to follow the business’s sales process. Custom work earns its place when it removes repeated manual steps or supports an essential transaction that the standard setup cannot accommodate.

5. P3 Media

Best for: Retailers changing their POS alongside other commerce technology.

P3 Media handles Shopify POS migration, setup, feasibility assessment, hardware review, custom configuration, training and ongoing optimization. Its engineering services cover ERP, order management, product information management and fulfillment integrations.

Its POS work also includes custom functionality for inventory synchronization, customer information capture and loyalty.

Many retailers are changing more than their checkout system. They are rebuilding the online store and reconnecting inventory and fulfillment applications at the same time. Having one agency coordinate these workstreams can simplify delivery responsibilities and reduce gaps between teams.

Product and customer data, hardware compatibility, training and integration testing all need to align before a store switches over. P3 Media’s combined retail and technology offering addresses that broader transition.

6. Kubix

Best for: Multi-location retailers connecting Shopify POS with NetSuite.

Kubix’s work for home furnishings retailer OKA offers a concrete example. It rolled out Shopify POS across 15 UK locations and connected it with NetSuite through integration partner Frogstack.

The project covered ERP-controlled pricing, trade-specific prices, migration of customers and gift cards, and transactions combining in-store stock with items fulfilled from a warehouse. Kubix also trained the retail and ecommerce teams on site.

One important detail is that the retail implementation and the NetSuite connection involved different delivery teams. Defining those responsibilities helps a retailer understand who handles store configuration, data exchange and problems that cross between systems.

For businesses with similar requirements, the OKA project demonstrates how POS deployment, backend pricing and store workflows can be coordinated across multiple locations.

7. Swanky

Best for: Brands deciding how physical stores should participate in ecommerce operations.

Swanky combines omnichannel retail strategy with Shopify POS services, including advice on click-and-collect, ship-from-store and in-store returns and exchanges. Its integration services include Shopify connections with NetSuite and Sage 200.

The strategy work is particularly relevant when a retailer is changing the role of its stores. A location can serve as a sales point, pickup point, fulfillment location or all three.

Each role changes how inventory is allocated, what employees are responsible for and what information needs to reach the ERP.

Settling these rules early helps stores follow a consistent process. Swanky’s offering brings retail planning and integration work into the same discussion, helping businesses define the operating model before building the supporting technology.

8. Visualsoft

Best for: Retailers wanting technical deployment and staff adoption handled together.

Visualsoft provides Shopify POS setup, hardware consultation and deployment, multi-location inventory configuration, staff training and ongoing support.

Its integration work connects Shopify and Shopify POS with ERP, fulfillment, loyalty and marketing platforms. It also develops custom Shopify applications for in-store requirements such as loyalty, customer information and promotions.

Including onboarding within the service scope matters because a technically complete system still needs to work for the people using it.

Training should cover everyday tasks: sales, returns, stock checks and customer lookup. Store staff need clear processes, while head office needs consistent information across locations and channels.

Visualsoft’s combination of implementation, integration and training is relevant to retailers treating employee adoption as part of the rollout.

9. Velstar

Best for: Businesses handling retail, B2B and backend operations within one project.

Velstar designs and implements Shopify POS and integrates Shopify with ERP, order management, CRM, fulfillment and finance systems. It also develops custom applications, handles migrations and provides B2B development.

That range is useful for businesses selling through physical stores, to trade accounts and online to consumers. Inventory can be shared across channels, while account access and purchasing terms may differ by customer type.

Working through those requirements often involves several applications and an integration layer that transfers information between them.

When evaluating Velstar, focus on the proposed architecture, ownership of each workstream and the support model after launch. The implementation should explain how the different sales channels will operate together and where separate rules are required.

10. blubolt

Best for: B2B businesses connecting ERP data with online and trade-counter purchasing.

blubolt connects Shopify with ERP, CRM, PIM, accounting, warehouse and fulfillment systems. Its B2B integration approach covers customer, product, pricing, inventory and order information, including data ownership and error handling.

Its Shopify B2B service also assesses POS and trade-counter requirements: identifying customers, applying account pricing, checking stock, taking payments and recording orders across online and in-person channels.

For wholesalers and distributors, the best starting point is a real trade-counter order. Identify the customer, apply their terms, confirm stock and establish which information must reach the ERP.

blubolt’s focus is relevant when those customer-specific rules need to be defined alongside the integration, particularly for businesses planning how online and in-person trade purchasing should work together.

What to Compare Before Choosing an Agency

Who Owns Each Type of Data

Decide which system controls each record. The ERP might manage purchasing and financial information while Shopify manages the selling experience.

Ask the agency how updates move between systems and how conflicting changes are prevented. Establish how location-level availability is calculated and what happens when stock is reserved, transferred, returned or damaged.

These decisions affect whether customers and employees see information they can rely on.

Full Transaction Flows

A successful sale is only the beginning of testing. Include partial returns, exchanges, cancellations, split fulfillment, discounts and orders involving several locations.

A transaction that looks correct in Shopify must also produce the expected inventory and accounting records downstream.

Agree in advance who checks those records and who approves the results. Testing should include the employees responsible for the processes, alongside the developers building the connections.

Rollout and Training

Ask for a pilot before deploying to every store. The pilot should test hardware, connectivity, permissions, integrations and ordinary staff tasks.

Decide who approves expansion to the remaining locations and what happens if a serious problem appears during rollout.

Store managers should know where to get help, how to report an issue and which procedures to follow while it is being resolved.

Integration Support

Find out who monitors failed data transfers, fixes errors and maintains connections after software updates.

If an agency works with an integration partner, assign responsibilities in writing. Store teams and operations staff need a clear route for reporting problems, with agreed escalation steps.

Support arrangements should also identify which issues are handled by the agency, the ERP provider and other software vendors.

Total Cost

Look beyond the connector subscription. Hardware, implementation, data migration, integration software, custom development, training and ongoing support all belong in the comparison.

Configuration, testing, exception handling and maintenance determine the work required to keep a connection reliable.

Compare proposals against the same requirements so differences in scope do not disappear behind a single project price.

Frequently Asked Questions

Can Shopify POS Connect to an Existing ERP?

Yes. Shopify can exchange information with ERP systems through vendor integrations, integration platforms or custom development.

The appropriate route depends on the ERP and the records and workflows that need to connect. The implementation should define which system controls each record, how frequently information updates and how failed transfers are handled.

Do Shopify POS and a Shopify Online Store Need a Separate Integration?

No. They share Shopify’s commerce environment, so sales, orders and inventory connect through Shopify’s administration system.

Adding an external ERP introduces a separate scope, including data mapping, synchronization rules and testing of processes that cross between Shopify and the ERP.

Which Agencies Offer Both POS Implementation and ERP Integration?

Fyresite, CQL, Sunrise Integration, SDG, P3 Media, Visualsoft and Velstar publish services covering both areas. Kubix’s OKA project demonstrates delivery involving a dedicated integration partner.

Compare each agency against your ERP, retail workflows, geographic requirements and expected level of support.

Can Shopify POS Support Custom In-Store Workflows?

Yes. Shopify POS supports apps and UI extensions that add functionality, including custom associate tasks and connections to other software.

The proposal should distinguish standard platform features from extensions, third-party software and custom development. This makes implementation responsibilities and recurring costs easier to understand.

Does Every Retailer Need an ERP?

No. The decision depends on operational complexity.

Businesses with substantial procurement, finance, warehouse or multi-entity requirements should evaluate whether their existing systems cover those needs. Shopify handles commerce functions, while an ERP plays a broader operational role.

Choose systems that fit the business and connect them where information needs to flow.

What Determines Implementation Time?

The main factors are the number of stores, hardware readiness, data quality, custom functionality and integration scope.

A rollout plan should separate discovery, development, testing, staff training, a pilot and expansion to additional locations. It should also identify dependencies, such as access to ERP specialists and store teams being available for testing.

Final Thoughts

A good Shopify POS and ERP agency understands what happens before, during and after a sale.

Start with the transactions your teams handle every day. Then define how inventory, customer information, orders and returns should move between systems. Choose a partner that can deliver those workflows, prepare employees to use them and keep the connections running after launch.