Custom API Integration

We Build the Connection
Your Vendors Didn't

Your tools have APIs. But no one built a connector between them. We write the custom integration code that handles the authentication, data mapping, error handling, and monitoring — so your tools actually talk to each other.

Describe Your Integration

The Problem

The Connector You Need Doesn't Exist

You've checked the marketplace. You've searched Zapier. The two tools you need connected don't have a pre-built integration. Or the one that exists only syncs basic fields and ignores the custom data that matters to your business.

Both tools have APIs — you can see the documentation. But building a reliable connection between them requires handling authentication, pagination, rate limits, data transformation, error recovery, and ongoing maintenance.

That's what we do. We read the API docs, build the connection, handle the edge cases, and keep it running.

Why off-the-shelf doesn't work:

No connector exists Neither vendor built a native integration. It's not in Zapier. You're stuck with manual data entry.
Existing connector is too limited It syncs names and emails but skips custom fields, line items, notes, and the data you actually need.
Zapier can't handle the logic Conditional routing, multi-step lookups, bi-directional sync, or data transformation that exceeds what a zap can do.
No error handling When a sync fails in Zapier, you get an email. When our integration fails, it retries automatically and alerts us if it can't recover.

What We Handle

Every Layer of the Integration

A custom API integration isn't just an API call. Here's everything we build into each connection.

Authentication

OAuth 2.0, API keys, JWT tokens, refresh flows. We handle initial auth setup and automatic token renewal so connections don't silently expire.

Field Mapping

Your CRM calls it "Company." Your project tool calls it "Organization." We map fields between systems, including custom fields, picklists, and nested objects.

Conditional Logic

Route data based on type, value, source, or any field. Different rules for different scenarios — not everything goes to the same place.

Retry & Recovery

Exponential backoff, dead letter queues, automatic retries. When an API call fails, the integration recovers without losing data.

Rate Limit Management

Every API has limits. We queue requests, throttle when needed, and batch operations to stay within vendor rate limits without losing data.

Monitoring & Alerts

Real-time monitoring of every integration. We track success rates, response times, and error patterns — and respond to issues before they affect your business.

The Process

How a Custom API Integration Project Works

1

API Review

We review both tools' API documentation, identify available endpoints, and determine the best approach for your data flow requirements.

2

Scope & Map

We define exactly what data flows where, map fields between systems, and document the routing logic. Fixed price proposal.

3

Build & Test

We build the integration with proper error handling, test with your real data, and deploy to our managed infrastructure.

4

Managed Service

We host, monitor, and maintain the integration. When APIs update or your needs change, we handle the adjustments.

The Big Picture

How It All Connects

Custom API integration data flow diagram

FAQ

Common Questions About Custom API Integration

What does "custom API integration" mean?

We build a purpose-built connection between your tools using their APIs — handling authentication, data mapping, error recovery, and monitoring for your specific use case.

What APIs can you work with?

Any documented REST API. CRMs, accounting platforms, project management tools, industry-specific software, payment processors, and internal tools.

How do you handle API authentication?

We support OAuth 2.0, API keys, JWT tokens, basic auth, and custom auth flows. Credentials are stored securely and tokens refresh automatically.

What if the API documentation is poor?

We reverse-engineer undocumented APIs when necessary. If a tool has an API but poor docs, we figure out how it works through testing.

Do you build it and hand it off?

No. We manage it ongoing. APIs change, tokens expire, vendors update endpoints. We host, monitor, and maintain the integration on our infrastructure.

Custom API integration is part of our broader API integration services.

View all API Integration Services →

What Two Tools Need Connecting?

Tell us what you're trying to connect. We'll review the APIs and tell you exactly what's possible.

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