Integration Services: Custom Connections Built To Hold
When there is no off-the-shelf plugin for what you need, we build a custom integration, tested against real edge cases and documented so your team is not locked into us to maintain it.
See sample deliverables →A custom integration is a build required when no existing plugin or native connector covers what you need, connecting your website to a CRM, ERP, or internal tool through a custom API or webhook build. We write it against real edge cases, document it, and build it on standard code so your team is never locked into MV3 to maintain it going forward.
Why "there is no plugin for that" is a common problem.
Most sites eventually need a connection that does not exist as an off-the-shelf product. The build quality is what determines whether it holds.
For requirements no plugin covers
Verified before it touches real data
Your team can maintain it, not just us
No proprietary framework lock-in
Scope and cost depend on the complexity of the systems being connected and the quality of their existing API documentation.
What ships when you engage a custom integration.
One-time build per integration. You own the code and documentation when we hand it off.
Priced per integration. Complexity varies significantly based on the systems and APIs involved.
A connection that survives beyond us.
Six concrete deliverables ship on every custom integration build.
Reviewing the APIs or systems involved and defining exactly what the connection needs to do.
The actual integration code, built against the scoped requirements.
Testing against malformed data, timeouts, and rate limits before the integration touches production.
Built-in handling for when the connected system is temporarily unavailable.
Written documentation covering how the integration works and how to maintain it.
A call to review the build with your team before we consider the engagement complete.
We scope the connection. Then we build it to hold.
A custom integration built without scoping the real edge cases is fragile the moment production data does not match the demo.
Exactly what the connection needs to do, before writing code.
Before building anything, we review the APIs involved, define the data flow, and identify likely failure modes.
- 1API and system review for both sides of the connection.
- 2Data flow mapping: what moves where, and how often.
- 3Failure mode inventory: timeouts, rate limits, malformed data.
- 4Error handling strategy defined before any code is written.
- 5Delivered as a written scope document before build starts.
Our team builds, tests, and documents the working integration.
Once the scope is signed off, we build the connection, test it against real edge cases, and document it for your team.
- 1Custom integration built against the signed scope document.
- 2Edge cases tested before the integration touches production.
- 3Error handling and retry logic built in from the start.
- 4Written documentation covering maintenance and troubleshooting.
- 5Handoff call to walk your team through the finished build.
Bundling multiple services? Request a custom proposal →
Three guarantees on every integration build.
If we miss any of them, we fix it at no additional charge.
Every integration is built on standard, documented code, not a proprietary framework that locks you into MV3 to maintain it.
Edge cases are tested against the integration before it ever touches real production data.
Written documentation ships at handoff so the integration does not depend on one person remembering how it was built.
What a real integration build actually looks like.
A sanitized view of the kind of build checklist your team receives at handoff.
Integration build status
Every integration is tracked through scoping, build, and edge-case testing before we consider it complete.
- API review completed for both connected systems
- Data flow mapped and confirmed with your team
- Edge cases tested: timeouts, rate limits, malformed data
- Error handling and retry logic built in
- Documentation delivered and reviewed at handoff
How we build every custom integration.
Five stages. Same protocol every engagement.
API and system review for both sides of the connection.
Written scope document defining data flow and failure handling.
The custom connection built against the signed scope.
Edge cases run before the integration touches production.
Written documentation delivered with a walkthrough call.
What teams report after a custom integration replaces a manual export.
Illustrative composites built from real engagement patterns, not verified individual clients. Used to make the working style concrete, not to claim a specific outcome for a specific company.
We had someone manually exporting and re-uploading data between two systems every week. MV3 built the connection that made that job disappear.
The documentation meant our own developer could pick up small changes later without needing to call MV3 for every tweak.
A previous vendor’s integration broke every time the third-party API changed slightly. This one has held up through two of their updates already.
Illustrative composite personas. Not verified statements from a named, specific client.
One-time implementation fee per integration. No ongoing management fee unless you add a maintenance retainer separately.
- Full API review before any code is written
- Custom connection built against a signed scope document
- Edge cases tested before the integration goes live
- Error handling and retry logic built in
- Written documentation for your team
- You own the code, built on standard, non-proprietary practices
Free scoping call. Written implementation quote inside 3 business days. You own the integration at handoff.
This is not for you if…
We hold a fit bar on this service. If any of the below is true, we'll say so on the call.
- An off-the-shelf plugin already does what you need. We will tell you that honestly rather than building something custom you do not need.
- The system you want to connect to has no API or documented way to integrate. We cannot build a connection to a system that offers no technical way in.
- You want this done with no one on your team able to maintain it. We build on standard code and document it specifically so this is not a risk, but we still recommend a named technical owner on your side.
- You need real-time, sub-second data sync at high volume. Most integrations here are not built for high-frequency, low-latency requirements; say so on the call and we will scope accordingly.
- You have not defined what the integration should actually do. We scope this together, but we need a starting point of what problem you are trying to solve.
If you’re a fit, keep scrolling. Or book the call now →
Questions buyers ask us.
Oversees MV3’s web development and integration builds. Every integration is reviewed by Vance before it reaches a client.
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