What are API integration services?

Connecting software systems through their APIs and webhooks so data moves automatically and correctly — for example keeping your CRM, billing and product in sync without manual copying.

How do you stop duplicate or out-of-order webhook events from causing problems?

Handlers are idempotent (processing the same event twice has no extra effect), check event order or current state before acting, and record which events have been processed. Payments and subscriptions are always handled this way.

Can you build a two-way sync?

Yes. The key is deciding which system owns each field and how conflicts resolve; we agree that before building, then add reconciliation checks so drift is caught.

How do you secure APIs?

Authentication with OAuth or signed tokens, permission checks on every request, input validation, rate limiting, HTTPS everywhere and secrets kept in a secrets manager.

Do you document the APIs you build?

Yes — OpenAPI specifications, generated client types and setup notes, so your team or partners can work with them without us.

API integration services

API integrations that keep your systems in sync — reliably

We connect the software your business runs on — CRM, payments, calendars, communication tools, your own product — with integrations that handle the hard cases: duplicate events, out-of-order webhooks, rate limits, expired tokens and data that disagrees between systems.

Discuss your integration See related work

Integrations fail quietly

Connecting two systems is easy on the happy path. The problems arrive later: a webhook delivered twice creates a duplicate customer, events arrive out of order and a cancelled subscription reactivates, an OAuth token expires on a Friday night, or both systems edit the same field and nobody knows which is right.

Those failures are rarely loud. Records drift apart until someone notices the CRM says one thing and the billing system another. We design integrations to make that drift impossible or visible — with clear ownership of every field, idempotent handlers and alerting.

How we build integrations that hold up

Clear ownership of every field

For each piece of data we decide which system is the source of truth and which ones mirror it, so two-way sync never becomes two-way overwrite.

Idempotent, order-safe webhooks

Handlers produce the same result whether an event arrives once, twice or late — essential for payments and subscription lifecycles.

Token and rate-limit handling

OAuth refresh with locking so parallel jobs do not race, backoff on rate limits, and alerts when a connection needs re-authorising.

Write locally, then sync

Changes are saved in your database first and stamped with the external ID once synced, so a third-party outage never loses data.

Reconciliation

Scheduled checks compare systems and report or repair drift, instead of trusting that every event arrived.

Documented APIs

Your own APIs come with an OpenAPI spec, typed clients and versioning, so partners and front ends can depend on them.

Integrations we commonly build

Payments and billing

Stripe subscriptions and one-time payments wired into accounts, entitlements, invoices and your CRM.

CRM sync

Two-way sync between your product and CRM (for example GoHighLevel), including pipelines, stages and tags.

Calendars and meetings

Google Calendar (multiple accounts), Outlook via Microsoft Graph and Zoom, for scheduling, availability and time tracking.

Communications

Transactional email, SMS and call logs (for example Resend and Twilio) tied to the records they belong to.

Integrations we have shipped

Desktop app · Integrations

A signed, auto-updating desktop app that builds timesheets from real activity

A cross-platform Electron app for macOS, Windows and Linux that assembles consultant timesheets from desktop activity, calendars, Zoom meetings and call logs, then syncs them to the firm's admin platform.

Read the case study SaaS · Payments · CRM integration

Membership platform for a mortgage-industry association: Stripe billing, CRM sync and a Bubble migration

A subscription membership platform — member dashboard, gated content, events, vendor marketplace and a 28-page admin portal — with tiered Stripe billing, a conference ticket checkout and two-way GoHighLevel CRM sync, migrated off a legacy Bubble app onto Next.js and Supabase.

Read the case study AI integration · MCP

Connecting an operations platform to Claude with a remote MCP server

A remote Model Context Protocol server that lets the consultancy's staff run their admin platform by asking Claude — invoicing, scheduling, follow-ups, time entries and contracts — with the same permissions they have in the app.

Read the case study

What we build

Third-party integrations

Connecting your product or internal tools to SaaS platforms through their APIs and webhooks.

Custom REST APIs

APIs for your web and mobile apps or partners, with authentication, permissions, pagination and documentation.

Sync and migration jobs

Scheduled and event-driven jobs that move data between systems, with retries, logging and reconciliation.

AI-ready APIs and MCP servers

Clean, validated endpoints that AI agents and tools such as Claude can use safely — see MCP server development.

How we deliver integrations

1
Map the data
Which records, which fields, which direction, which system wins on conflict. Written down before code.
2
Prove the hard cases
We test duplicates, ordering, failures and rate limits against sandbox accounts early, not after launch.
3
Build with observability
Every sync logged with enough context to answer "what happened to this record?" in minutes.
4
Backfill and reconcile
Existing data migrated and checked so both systems start from the same truth.
5
Monitor and maintain
Alerts on failures and expiring connections; updates when third-party APIs change.

Technology we use

APIs & runtimes

Node.js
TypeScript
Python / FastAPI
Next.js route handlers
OpenAPI

Platforms we have integrated

Stripe
GoHighLevel
Google Calendar & Drive
Microsoft Graph
Zoom
Twilio
Resend
RevenueCat

Data & jobs

PostgreSQL
Supabase Edge Functions
Database triggers
Cloud Tasks / cron

Integration and deployment considerations

Credentials

API keys and OAuth secrets live in a secrets manager under your accounts, never in the codebase.

Sandbox first

Every integration is built and tested against sandbox or test accounts before touching production data.

Vendor changes

Third-party APIs deprecate endpoints and change limits; maintenance retainers include keeping integrations current.

Compliance

We document which data flows to which vendor, so security reviews and data-processing agreements stay accurate.

What drives the cost

A single one-way integration with a well-documented API is a small project. Costs grow with two-way sync, the number of systems, data migration and how forgiving the business process is of errors. We quote after mapping the data with you.

Number of systems and direction of sync
Quality of the third-party APIs and webhooks
Conflict rules and reconciliation needs
Historical data to migrate
Volume and rate limits
Monitoring and alerting requirements

Who this is for

Teams copying data between systems by hand.
SaaS products that need reliable payments, CRM or calendar integrations.
Businesses whose existing integrations create duplicates or drift.
Companies preparing their systems for AI agents and tools.

Related services

Custom Software Development MCP Server Development SaaS Development Custom Web Development

API Development & Integration: common questions

Tell us which systems need to talk to each other

Tell us what you are building or what needs fixing. You will hear back from an engineer — not a sales rep — within one business day, usually with questions or a rough approach.

Your enquiry goes straight to our engineering team — the people who will scope and build your project, not a sales desk.

sales@dablewdevs.com Book a free 30-min call