How to Catch Broken Integrations & API Issues (Before Revenue Does)

First, Why Do Website Integrations Break?

Once a site depends on connected tools, there are more moving parts in play, and it doesn’t take much for one of them to slip out of sync. In our experience, here’s what often leads to broken API connections:

Someone Changed a Field or Rule in One System,

This is a really common one. A field gets renamed in HubSpot. Salesforce starts expecting a new required field. A form still collects the same user input, though the receiving system now expects the information in a different format.

When that happens, the site sends an API request and the other system pushes back with vague error messages. Sometimes the issue comes down to invalid parameters, which is just a technical way of saying the site sent the wrong kind of value, or sent it in the wrong shape.

Access Changed in The Background

A lot of integrations rely on API keys, tokens, or permission settings running in the background. They’re a bit like digital passes that let one system talk to another. If someone updates access, removes a user, or needs to regenerate API keys, the connection can stop working even though the page still looks fine.

That can leave one system unable to access resources it needs, which might mean a form no longer sends data into the CRM or a tool can’t pull back the right information.

A Provider Changed Something on Their Side

Sometimes, software vendors will update API versions, retire older endpoints, or change how a REST API (a way tools pass information back and forth over the web) expects to receive data. Your site keeps sending the same client request it sent last month, but the platform on the other side has changed the rules.

Quick Fixes Built Up Over Time

You’ll see this a lot on older sites. Someone patched one issue. Then someone else added a workaround. Then a plugin got swapped, a custom tweak got added, and no one ever really stepped back to clean up the bigger picture.

By the time an API failure occurs, the actual problem may have been building for a while. Once the integration breaks, the team often finds itself tracing through years of old decisions, trying to work out which one is now getting in the way. 

Security Settings Drifted

Integrations can run into trouble when the security side gets outdated. Old permissions, weak passwords or keys, and scripts no one has looked at in ages can all create security risks and wider security vulnerabilities, especially when the setup handles sensitive data.

How Does This Show Up In Marketing?

You probably won’t come across a broken integration as one big, obvious outage. It usually feels more like a pile of smaller problems that don’t quite make sense until someone traces them back to the integration layer.

You might notice:

• Form submissions that never make it into the CRM
• Lead volume dipping with no clear explanation
• Attribution drifting away from what sales is seeing
• A login or SSO journey failing halfway through
• Tools pulling stale data instead of clean data retrieval
• Automation flows that break after the website hands the information off to the next system
• Booking or payment tools failing to complete the data exchange properly

That’s the part that gets expensive. Marketing ends up working from incorrect or missing information, sales teams follow up too late or not at all, and the site starts feeling less and less trustworthy over time.

How to Check for Broken Integrations

If you think something is off, start with the journeys tied closest to leads, sales, and reporting. You’ll get much further by tracing one real flow properly than by hopping between five half-checked tools.

Start with The Most Business-Critical Flows

Go straight to the areas tied to revenue and follow-up. Demo requests, contact forms, gated content, pricing tools, login flows, customer portals, and anything sales depends on should be near the top of the list.

Follow The Full Journey

Submit the form yourself. Run the login. Go through the booking flow. Download the gated resource. Then check what happened after the page said everything was fine.

Did you land where you should? Did the right person get notified? Did the right fields come through? If the front end says “success” and the CRM shows nothing, you’ve learned something useful already.

Compare Both Sides of The Handoff

Look at what the website sent and what the other system accepted. If your form passed five fields and the CRM only received three, or one field landed blank, that points you in a much better direction than “the form seems broken.”

Look at Logs & Alerts

If you’ve got access to logs, open them. You’re looking for rejected requests, missing fields, permission issues, failed syncs, and anything returning error codes or provider warnings.

Pull Out The User Docs

Good API documentation from HubSpot, Salesforce, or whatever platform you’re using will help you see what the connection expects, anything that has changed, and how the provider wants errors handled.

Review Who Owns The Connection

Find out who created it, who controls the credentials, and who would know if it stopped working. Plenty of integration trouble drags on because nobody is quite sure who’s in charge of what.

If you’re stepping back and looking at the wider site picture too, 10 Website Upgrades That Improve Marketing Results The Most is worth reading.

Understand The Most Common API Error Codes

The clues are usually there. They just tend to show up in more technical language than you’re probably used to, often in the form of API error codes. So let us explain each one:

Status Codes

A status code is the number one system sends back after another system asks it to do something. That number helps point to the broad error category involved.

400-Level Clues

Some of the common API error codes live here. A 400 often means the request was badly formed. A 401 or 403 usually points to login, authorization, or permission trouble. A 404 often means the requested resource isn’t where the system expected to find it anymore.

500-Level Clues

A 500-level response usually means the receiving platform hit a problem while trying to process the request. You may not get much detail back, though it does tell you the issue sits further along the chain.

Want Help Identifying and Fixing Broken Integrations?

This is the layer a lot of agencies don’t spend much time in. They’ll look at the page, the design, the CMS, maybe the analytics setup, and stop there. Not with us. 

We’ve spent a lot of time in this territory, including building the Freeform-HubSpot integration. So if you want to inspect whether your integrations are working properly, our paid Tech Plan is built for exactly that. Reach out now to book yours.