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WestchesterAI
API development and system integrations
API & Integration Development

Every Integration Here Is Running in Production

We connect systems, build custom APIs, and integrate payment processors, messaging platforms, data sources, and AI services. Not tutorial projects — live systems handling real transactions.

6+ APIsin production — Stripe, Twilio, Shopify, Supabase, Resend, and NYC Open Data. Real integrations, not demos.
Production Integrations

APIs We Work With Every Day

These are not APIs we read the docs for once. These are services integrated into multiple live applications that we maintain and operate.

Stripe

What We Do

Payment processing, subscription billing, invoicing, checkout sessions, webhook handling

Where It Runs

ShowFloor.ai, PermitBeam, TLC Directory — all processing live payments through Stripe integrations we built

Twilio

What We Do

SMS messaging, voice calls, AI voice assistants, call routing, verification codes

Where It Runs

AI call handling, review request automation, appointment reminders — integrated into client workflows

Shopify APIs

What We Do

Storefront API (headless commerce), Admin API (product management), GraphQL mutations, staged uploads

Where It Runs

Multiple Shopify stores with custom sections, bulk product operations, and media management via API

Supabase / PostgreSQL

What We Do

Database design, Row Level Security, real-time subscriptions, auth, edge functions, storage

Where It Runs

Eight Supabase projects in production — ShowFloor, PainOptix, PermitBeam, TLC, KCF, PNY, TaskTally, Command Center

Webhooks & Custom APIs

What We Do

Receiving webhooks from external services, building custom REST and GraphQL endpoints, data transformation

Where It Runs

Stripe webhook handlers, NYC Open Data API ingestion for PermitBeam, Google Places API for directory data pipelines

Email & Communication

What We Do

Resend for transactional email, SendGrid for marketing, Beehiiv API for newsletter management

Where It Runs

Six verified sending domains, automated digest delivery, subscriber management, contact form processing

Custom APIs

We Build APIs Too

Beyond connecting to third-party services, we build custom API endpoints for your applications. Need your website to talk to your inventory system? Need a webhook that processes form submissions and routes them to different teams? Need a data pipeline that pulls from a government database every night?

We have built all of these. PermitBeam pulls from four NYC Department of Buildings APIs on a schedule. Our directory sites ingest data from state databases via automated pipelines. ShowFloor processes AI image generation requests through custom API routes.

REST APIs

Standard HTTP endpoints with proper status codes, error handling, rate limiting, and authentication. JSON request/response format.

GraphQL

Typed queries and mutations for complex data requirements. Used extensively with Shopify Admin API and Supabase.

Webhooks

Receiving and processing events from external services — Stripe payment events, form submissions, inventory changes, scheduled triggers.

Data Pipelines

Scheduled ingestion from external data sources — government databases, business directories, real estate listings, permit filings.

Need Systems Connected?

Tell us what needs to talk to what. We will scope the integration, give you a fixed price, and have it running in production.