API Integration Services — wire your stack so it actually behaves like one stack
Bidirectional, idempotent integrations between your CRM, billing, comms, and product — built to survive retries, schema drift, and outages.
Most companies don't have a software stack — they have eight tools and a Zapier flow held together by hope. The CRM doesn't know what the billing system knows. The product doesn't know what the support tool knows. The finance team exports CSVs. By the time anyone notices the data is drifting, the customer's already churned. We build the integration layer that turns those eight tools into one stack. Bidirectional sync where it matters, one-way push where it doesn't, idempotent webhooks, retry with backoff, dead-letter queues for the unfixable, and a reconciliation job that catches drift inside 24 hours instead of next quarter. We've wired Stripe ↔ Postgres ↔ HubSpot, GitHub ↔ Linear ↔ Slack, Twilio ↔ CRM ↔ data warehouse, and dozens of other combinations. The pattern is the same; the specific endpoints change.
About this service
When you need integration vs. when you need a product
Integration is the wiring, not the product
If the work is gluing existing tools together so they share state, that's an integration engagement and lives here. If the work is building a new product surface that happens to call several APIs, that's a SaaS build or MVP — we'll route you to whichever fits.
Most companies past the 20-employee mark need integration work continuously. New tool in the stack? New integration. Pricing model change? New webhook. New compliance requirement? New audit log. We do both one-off projects and ongoing retainers.
Webhook reliability
The bug most teams ship without realising
The single most common integration bug we inherit: webhook handlers that aren't idempotent. The upstream service retries (Stripe, Shopify, Twilio, GitHub all do), the handler creates duplicate records, the data drifts, and three months later nobody can explain why the customer count on the dashboard doesn't match the customer count in the CRM.
Every webhook we ship is idempotent by event ID, retried with backoff, dead-lettered when unfixable, and visible on a delivery-health dashboard. This is non-negotiable, regardless of the integration target.
Adjacent surfaces
Often paired with Stripe and Automation Scripts
A meaningful slice of our integration work is Stripe-adjacent — Stripe ↔ accounting, Stripe ↔ CRM, Stripe ↔ data warehouse — see Stripe Integration. The rest of it overlaps heavily with Automation Scripts: the integration is the wiring, and the scripts are the workflow logic that runs on top.
Real api integration services patterns we’ve shipped
Not adjectives. Specific shapes of build we’ve taken to production for clients like you.
Stripe ↔ HubSpot / Salesforce
Bidirectional sync: new Stripe customer creates / updates the CRM record, MRR and plan tier reflected on the deal, churn events update lifecycle stage.
Product ↔ data warehouse
Event firehose from your product into Snowflake / BigQuery / Postgres, with schema versioning, late-arriving event handling, and replay capability.
GitHub / GitLab ↔ Linear / Jira ↔ Slack
PR opened → ticket linked, status synced, Slack notified; ticket moved → branch labeled; PR merged → ticket closed. With audit trail.
Twilio / SendGrid ↔ CRM
Inbound calls and SMS attached to the right customer record, automated follow-up sequences driven by CRM events, opt-out compliance.
Shopify ↔ inventory / ERP
Stock levels synced bidirectionally, order events fed to fulfilment, partial-shipment reconciliation, returns reflected back in the storefront.
Accounting (Xero / QuickBooks) ↔ Stripe ↔ Bank feed
Stripe payouts auto-reconciled against bank feed, invoices issued and matched, sales tax reported correctly, finance team stops doing it manually.
Support tool ↔ product ↔ status page
Customer-impacting incidents surface in support tool with affected-customer lists pre-populated; status page updates feed customer comms automatically.
AI / LLM ↔ your internal APIs
Tool wrappers exposing your internal APIs to an [AI agent](/services/ai-agent-development) with strict schemas, scoped credentials, and full audit logging.
How a API Integration Services engagement actually runs
Five concrete steps with deliverables. No retainer fog.
Stack map
We map every tool in your stack, what data lives where, who's the source of truth for each entity, and where the drift currently happens. Output: a written stack diagram and a prioritised list of integration gaps.
Schema + contract design
We design the canonical entity schemas, the JSON contracts between systems, the idempotency keys, and the conflict-resolution rules (which system wins when CRM and billing disagree about a customer's email). Sign-off before code.
Build the wiring
Webhook receivers, queues, retry policies, dead-letter queues, reconciliation jobs, and the observability dashboard. We build the unsexy half first because it's the half that keeps the books straight.
Backfill + reconciliation
We backfill historical data, reconcile against current state, and surface every drift we find. Often we discover bugs in the customer's existing process this way — we'll flag them rather than paper over.
Handover + monitoring
Documentation, runbook, on-call alerts, and the integration-health dashboard your ops team will actually look at. 30 days of bug-fix support.
Real brackets, no surprise invoices
Starting points. Exact quote on the scoping call — written, fixed, no hourly surprises.
Single Integration
One direction, one pair of systems
- Idempotent webhook handler
- Schema validation + alerting
- Reconciliation job
- Runbook + 30 days support
Stack Wiring
Multiple bidirectional integrations
- Up to 5 system pairs wired
- Canonical schema layer
- Conflict-resolution rules
- Integration health dashboard
- Backfill + reconciliation
- 60 days support
Integration Retainer
Ongoing — new integrations + ops
- 1–2 new integrations per month
- Existing integrations kept healthy
- Schema drift detection
- On-call for critical drift
Things real buyers ask before paying
If yours isn’t here, ask on the scoping call.
Often shipped alongside this
Automation Scripts
Custom scripts and workflow automations that quietly do hours of work in the background, every day.
Web Scraping Services
Headless-browser scraping, structured extraction, and resilient pipelines — built TOS-aware and built to last.
Stripe Integration
Production-grade Stripe wiring — Checkout, Billing, Connect, Tax, and Radar — with the webhook reliability that keeps the books straight.
Real builds in production
Ready to scope a API Integration Services build?
60-second AI consult and you’ll leave with a written plan. Prefer humans? Drop a custom quote request — we reply within a working day.