Technology · API Integrations

Stop entering the same data twice.

Most growing businesses run on three to seven systems that don't talk to each other. Orders get re-typed. Inventory drifts. Reports take days. We connect them — cleanly, with monitoring, and built to last.

Book a discovery call See what we connect

API integration services connecting business systems for SMBs in San Diego and Tijuana

The hidden cost

Disconnected systems aren't a tech problem. They're a margin problem.

What it looks like

·Sales rep enters the order in the CRM. Operations enters it again in the WMS. Accounting enters it a third time in QuickBooks.
·Inventory in Shopify says 12. Warehouse counts 7. Nobody knows which is right until somebody complains.
·End-of-month reports take three days because someone has to download CSVs from four platforms and reconcile them in a spreadsheet.
·A retail partner requires EDI onboarding. The team panics because nobody knows what 850 or 856 means.

What it actually costs

10 to 25 hours per week of duplicate data entry across the team
Stockouts and overselling from inventory drift
Decisions made on stale data because reports are always late
Lost contracts because you can't meet integration requirements
Burnt-out staff doing work that should be automated

A solid integration usually pays for itself within 2 to 6 months. After that, it keeps paying every month.

What we connect

If it has an API or supports EDI, we can connect it.

E-commerce

Storefronts & marketplaces

· Shopify (REST, GraphQL, webhooks)
· WooCommerce
· Amazon Seller Central
· Custom storefronts

ERP & accounting

Business systems

· NetSuite
· SyteLine
· QuickBooks Online & Enterprise
· Custom ERPs (any with an API)

Warehouse & fulfillment

WMS & 3PL platforms

· Manhattan WMS
· 3PL platforms with APIs
· Loop, Happy Returns
· Custom warehouse systems

Retail EDI

Trading partner connections

· SPS Commerce
· TrueCommerce
· DSCO
· Direct EDI X12 (850, 855, 856, 810)

CRM & marketing

Customer systems

· HubSpot, Pipedrive
· Mailchimp, Klaviyo
· Custom CRMs
· Calendly, Cal.com

Custom & legacy

The hard cases

· Legacy systems with no modern API
· SOAP services
· Direct database connections
· File-based exchanges (CSV, XML)

Don't see your system? It's probably still doable. Tell us in the discovery call.

How we build it

Not a Zapier flow. Not a duct-tape script.

We build integrations the way an engineer who has been on call at 2 AM would build them. Logged, monitored, retryable, and easy to maintain six months later.

Principle 01

Idempotent by default

The same event can run twice without breaking anything. Webhooks retry, networks fail, queues redeliver — and your data stays consistent.

Principle 02

Fully logged

Every transaction is logged with payload, timestamp, and outcome. When somebody asks “why did order #4521 not sync?”, we have the answer in 30 seconds, not three days.

Principle 03

Monitored and alerted

Failures don't hide. We set up alerts (email, Slack, or whatever you use) so issues get caught before customers complain. You see the integration's health, not just its existence.

Principle 04

Documented for handoff

Every integration ships with documentation a different developer could read and understand. Even if you never need it, you own it. Vendor lock-in is not our model.

The stack

Boring, reliable, battle-tested.

We pick what works in production for years, not what trends on Twitter. Most of our integrations run on a stack a senior engineer can pick up cold.

Languages

Python (FastAPI, Django)
Node.js
JavaScript / TypeScript

Protocols

REST (JSON)
SOAP (XML)
EDI X12
Webhooks

Data

MySQL
PostgreSQL
Redis (queues, cache)

Middleware

WebMethods (when needed)
Custom Python middleware
Boomi, Celigo (when fitting)

Hosting

Linux (CentOS, Ubuntu, RHEL)
Private servers
Client-managed cloud

Observability

Structured logging
Email & Slack alerts
Custom dashboards

A recent integration

A clinic with three systems and no shared data.

API integration connecting medical clinic CRM with clinical engagement platform

HealthcareREST + Webhooks

The clinic was running a website, a custom CRM, and a clinical engagement platform — all separate. New leads from the site never reached the CRM. CRM updates never reached the engagement platform. Every patient had to be re-entered manually three times.

What we built

·Website-to-CRM webhook for instant lead capture
·Bidirectional sync between CRM and clinical engagement platform via REST API
·Logging dashboard so the team can see every patient's sync status
·Slack alerts when a sync fails so it gets handled in minutes, not days

Currently in deployment. Manual re-entry of patient data eliminated.

Common questions

What people ask before signing.

How long does an integration take to build?+

A simple two-system integration (e.g., Shopify to QuickBooks) typically takes 1 to 2 weeks. Mid-complexity multi-system flows take 3 to 5 weeks. Enterprise integrations with EDI, custom mapping, and error recovery can range 6 to 12 weeks. We give you a clear timeline after the discovery call.

What if my system doesn't have a modern API?+

If the system supports SOAP, EDI, file exports (CSV, XML), or even direct database access, we can connect it. We've worked with legacy systems including SyteLine, Manhattan WMS, and Oracle on RHEL. If a system has any way to read or write data programmatically, we can integrate it.

Do you handle EDI for retail trading partners?+

Yes. We have direct experience with EDI X12 (850, 855, 856, 810, 940, 945) and trading partner integrations through SPS Commerce, TrueCommerce, and DSCO. If you're being asked to onboard with a retail partner that requires EDI, we can deliver.

Can you maintain integrations after launch?+

Yes. Every integration includes 30 days of post-launch support and monitoring. After that, we offer monthly retainer plans or on-demand maintenance. APIs change, vendors push updates, and edge cases appear over time. We stay close enough to handle them.

Why not use Zapier or Make?+

For small, low-volume flows, those tools are great — and we'll often recommend them. For anything with high volume, complex transformations, custom error handling, or strict reliability requirements, no-code platforms become expensive and fragile. We'll tell you honestly which path fits your case.

Free discovery call · 30 minutes

Tell us which systems you have.
We'll tell you what's possible.

30 minutes. No pitch. We map your stack, identify the bottlenecks, and tell you honestly what an integration would look like — including a real timeline and budget range.

Book the discovery call

Or email us at cs@ink-stains.com