Choosing an integration partner for a B2B eCommerce initiative is one of the most consequential vendor decisions an enterprise organization makes — and one of the least well-defined.
There is no shortage of firms willing to take on integration work. Systems integrators, iPaaS platform partners, boutique development shops, and full-service eCommerce agencies all offer integration services to some degree. The range of actual capability behind those offerings is enormous.
The cost of choosing poorly is high. A failed or underperforming integration does not just delay your go-live. It creates ongoing operational drag that undermines the business case for the entire commerce investment — for years.
This guide gives enterprise teams a practical framework for evaluating integration partners: what to look for, what to ask, and what answers should give you pause.
What You Are Actually Evaluating
Before getting into specific questions, it helps to be clear about what differentiates a capable integration partner from one that will create problems.
Integration work in a B2B eCommerce context is fundamentally different from general web development or even general systems integration. The relevant variables are specific: familiarity with enterprise commerce platforms, depth of experience with the ERP and CRM systems you actually use, track record with the integration patterns your environment requires, and the operational model they will use to support the integration after go-live.
You are not just evaluating whether a partner can build integrations. You are evaluating whether they can build the right integrations for your specific environment, maintain them as that environment changes, and operate as a strategic partner through the complexity that will inevitably arise.
Keep that framing in mind as you work through the evaluation.
The Questions That Reveal Actual Capability
On B2B eCommerce Integration Specifically
"Can you walk us through two or three B2B eCommerce integration projects you have delivered — specifically the systems involved, the complexity you encountered, and how you resolved it?"
The answer to this question tells you more than any capability statement. A partner with genuine B2B eCommerce integration experience will give you specific, detailed answers: the ERP was SAP S/4HANA and the pricing model required custom BAPI calls; the order workflow had four approval stages that spanned three systems; the product catalog had 200,000 SKUs and the sync needed to happen without impacting storefront performance.
Vague answers — "we have done many similar projects" — are a red flag. So are answers that describe projects that are primarily B2C rather than B2B. Consumer commerce integration and enterprise B2B integration are not the same work.
"What are the most common integration failure modes you see in B2B eCommerce, and how do you design to prevent them?"
An experienced partner will have a clear, specific answer to this question. They will be able to describe the patterns that cause integration projects to fail and articulate concrete practices that address each one. If the answer is general or optimistic — "we have a strong methodology and careful quality assurance" — it suggests they have not been in enough challenging environments to have developed that pattern recognition.
"How do you handle integration performance requirements? What is your approach to caching, latency budgets, and load testing?"
Integration performance is a discipline, not an afterthought. Partners who understand it will talk about designing for specific latency thresholds, caching strategies for data that does not need to be retrieved in real time, and load testing protocols that simulate production conditions. Partners who do not understand it will tell you that their integrations are performant without being able to explain specifically how they ensure that.
On Your Specific Systems
"What is your experience with [your ERP]? How many implementations have you run? Can you give us a reference?"
This is non-negotiable. If your ERP is SAP, you need a partner with genuine SAP integration experience — not familiarity in principle, but hands-on work connecting commerce platforms to SAP in production. The same is true for Oracle, Microsoft Dynamics, JD Edwards, NetSuite, or any other enterprise ERP.
The reason is straightforward: every ERP has idiosyncrasies. SAP's pricing and order management logic, Oracle's data model, the specific connector requirements for each — these things can only be learned by doing the work. A partner who claims ERP experience they do not have will discover the complexity on your timeline and your budget.
"Which iPaaS or middleware platforms do you work with, and what drives your recommendation for a given client?"
A partner who works with a single integration platform and recommends it to every client is not doing platform selection — they are selling what they know. A capable partner works across multiple platforms and can articulate clearly why they would recommend one over another for a specific environment.
If they recommend Boomi, they should be able to explain why Boomi's connector library or Master Data Hub is the right fit for your specific situation. If they recommend MuleSoft, they should be able to articulate why the API management capabilities justify the additional complexity. The reasoning matters as much as the recommendation.
"What do you do when a system you are integrating does not have a well-documented API?"
This question surfaces experience with real-world enterprise environments. Legacy ERP systems, on-premises CRMs, and older warehouse management systems are common in B2B organizations — and many of them were not designed with API integration in mind. Experienced integration partners have strategies for these situations: file-based integration, database-level connectivity, custom middleware, event-based workarounds. Partners without that experience will not know what they do not know until it becomes your problem.
On Architecture and Governance
"How do you approach data modeling at the start of an integration project?"
The canonical data model — establishing shared definitions of customers, products, orders, and other core entities across systems — is one of the most important foundational decisions in an integration project. Partners who take this seriously will describe a structured process: workshops with stakeholders from each system, documentation of the agreed model, a defined system of record for each data element.
Partners who skip it will tell you they handle data mapping as they go. That is how you end up with embedded business logic no one understands and a data layer that produces errors no one can diagnose.
"What does your ongoing support and maintenance model look like after go-live?"
Integration is not a project that ends at launch. Systems change. Business rules evolve. New channels and platforms get added. The integration layer has to evolve with them.
Ask explicitly: who owns the integration after go-live? Is there a dedicated support team or does post-launch work go to the back of a queue? What is the SLA for responding to integration failures in production? How are changes to the integration managed and documented?
A partner with a clear, staffed answer to these questions has thought through the full lifecycle of the engagement. A partner who treats this as a detail to be worked out later has not.
"How do you document the integrations you build?"
Documentation quality is a reliable proxy for the overall quality of an integration partner's operational practices. Ask to see an example of documentation from a previous integration project (appropriately anonymized). What you are looking for: data flow diagrams, field-level mapping documentation, error handling runbooks, and enough detail that a developer who did not build the integration could maintain it.
If documentation is sparse, inconsistent, or produced as an afterthought, the integration itself will be too.
On References and Track Record
"Can you connect us with two or three clients who have been running integrations you built in production for at least two years?"
The two-year threshold matters. Almost any integration looks functional in the first few months after go-live. The real test of integration quality is how it holds up as systems change, volumes grow, and edge cases surface over time. References who have been in production for two-plus years can speak to the durability of the work — whether the integration required constant intervention, whether the documentation was sufficient for their team to operate it, whether the partner was responsive when problems arose.
Ask those references directly: if you were starting this project again, would you choose the same partner? What would you do differently? What surprised you about the integration work that you were not expecting?
Red Flags Worth Naming Explicitly
A few patterns that consistently appear in integrations that go wrong:
The partner has deep platform expertise but thin integration experience. Adobe Commerce partners, Shopify Plus partners, and other platform-certified firms vary enormously in their actual integration capabilities. Platform certification tells you they can implement the commerce platform; it does not tell you they can connect it reliably to your ERP. Ask specifically about integration experience, not just platform experience.
The proposal underestimates integration scope significantly. If a partner's proposal treats integration as a line item rather than a substantial component of the engagement, they have either underestimated the work or they plan to manage overruns through change orders. Either is a problem. Integration in a complex B2B environment should represent a significant portion of an implementation budget — if it does not, something is wrong with the estimate.
They cannot describe their error handling approach clearly. How a partner handles integration failures — what gets logged, how errors are surfaced, how data is recovered after a failure — reveals their operational maturity. Partners who have not thought carefully about failure handling have not run enough integrations in production.
They resist a phased or pilot approach. A confident partner with genuine experience will often recommend validating the integration architecture with a focused pilot before full implementation. A partner who pushes back on phasing — especially for a complex integration environment — may be more interested in committing the full scope quickly than in managing the project risk responsibly.
The Decision Framework
Evaluating integration partners is not a scorecard exercise. The variables are too interdependent and the stakes too high for a weighted rubric to capture what matters.
What you are really looking for is a combination of three things: proven experience in environments that are genuinely comparable to yours, an approach to architecture and governance that reflects hard-won lessons rather than theoretical best practices, and operational practices that will support the integration over its full lifecycle — not just through launch.
The partner who has the most impressive client logo list is not necessarily the right choice. The partner who can speak most concretely and specifically to the challenges of your specific environment usually is.
Frequently Asked Questions About Choosing an eCommerce Integration Partner
What should I look for in a B2B eCommerce integration partner?The most important factors when evaluating a B2B eCommerce integration partner are: demonstrated experience with B2B-specific integration complexity (not just general web development or B2C commerce), deep familiarity with the specific ERP and CRM systems in your environment, fluency across multiple iPaaS platforms with clear reasoning for their recommendations, a defined approach to data modeling and integration governance, and a post-launch support model that treats integration as an ongoing capability rather than a completed project. References from organizations of comparable size and technical complexity, running integrations in production for two or more years, are the strongest validation of a partner's actual capability.
How do I know if an agency has real integration experience versus general development capability?Ask for specific case studies that describe the systems involved, the integration complexity encountered, and how it was resolved. Experienced integration partners will give detailed, concrete answers — the ERP was SAP and required custom BAPI calls for pricing; the order workflow spanned three systems with four approval stages. Vague answers, or case studies that are primarily B2C rather than B2B, suggest the partner's integration experience is more limited than their proposal implies. Also ask how they handle systems without well-documented APIs — a question that surfaces experience with the legacy enterprise environments common in B2B.
What questions should I ask an integration partner before signing a contract?Key questions to ask an eCommerce integration partner before signing include: Can you walk us through comparable B2B integration projects you have delivered? What is your experience with our specific ERP? Which iPaaS platforms do you work with and how do you decide which to recommend? How do you approach data modeling at the start of a project? What does your error handling and monitoring approach look like in production? What is your post-launch support model and who owns the integration after go-live? Can you provide references from clients who have been running your integrations in production for at least two years?
How much of an eCommerce implementation budget should go to integration?In a complex B2B eCommerce implementation, integration work should represent a substantial portion of the overall budget — often 30 to 50 percent or more, depending on the number of systems involved, the complexity of the data models, and the state of the legacy infrastructure. If a partner's proposal treats integration as a minor line item, it is a strong signal that the scope has been underestimated, either through inexperience or to win the work. Underestimated integration scope is one of the most common drivers of budget overruns and timeline extensions in enterprise commerce implementations.
Echidna is a B2B eCommerce digital agency and certified Boomi partner. We have run enterprise integration projects across manufacturing, distribution, and specialty retail — connecting commerce platforms to SAP, Oracle, Microsoft Dynamics, NetSuite, Salesforce, and a range of other enterprise systems. If you are evaluating integration partners or trying to understand what your specific environment requires, we are happy to have that conversation. Talk to our integration team →