Integrations & APIs
Connect everything you run on.
We build custom REST and GraphQL APIs, webhooks, and integrations that link your software to payments, CRMs, email, AI models, and data — anything with an API. If a tool doesn’t have one, we build the connector.
The connections we build
Custom REST & GraphQL APIs
Designed, documented, and versioned APIs that other systems can build on.
Third-party API integrations
Connect your product to the SaaS and services your business already runs on.
Webhooks & event pipelines
Real-time event handling so systems react to each other automatically.
Payment & billing integrations
Checkout, subscriptions, invoicing, and reconciliation wired in cleanly.
Auth, SSO & OAuth
Single sign-on and secure access with SAML, OIDC, and OAuth 2.0.
Data sync & ETL pipelines
Move and transform data between apps, warehouses, and databases on a schedule.
AI & LLM integrations
OpenAI, Anthropic, and other model APIs embedded into your product and ops.
Legacy & ERP connectors
Bridge older or internal systems that don’t offer a modern API.
Services & APIs we connect to
A starting list, grouped by what it does. It isn’t exhaustive — if a service has an API, we can almost certainly integrate it.
Payments & Billing
CRM & Sales
Email, SMS & Messaging
E-commerce
Accounting & Finance
AI & LLMs
Auth & Identity
Cloud & Storage
Analytics & Data
Calendar & Scheduling
Maps & Location
Documents & E-signature
Productivity & Ops
Shipping & Logistics
Support & Help Desk
Integrations, answered
- What APIs and services can Appex Technology integrate with? +
- We integrate with payment gateways (Stripe, PayPal, Square), CRMs (Salesforce, HubSpot), email and SMS (SendGrid, Twilio), AI models (OpenAI, Anthropic, Gemini), accounting tools (QuickBooks, Xero), e-commerce, analytics, calendars, maps, and effectively any service that exposes a REST or GraphQL API.
- Can you build a custom API? +
- Yes. We design, build, document, and version custom REST and GraphQL APIs, along with webhooks and event pipelines, so your own systems, partners, and apps can build on them securely.
- Do you build Stripe and payment integrations? +
- Yes. We implement checkout, subscriptions, metered billing, invoicing, and reconciliation with Stripe, PayPal, Square, Braintree, Adyen, and similar providers — handling webhooks and edge cases properly.
- Can you connect our existing or legacy systems? +
- Almost always. Even tools without a modern API can be connected through custom connectors, file or EDI exchange, scheduled data sync, or direct database integration. If it holds data you need, we can usually reach it.
- Do you integrate AI models like OpenAI or Claude? +
- Yes. We embed large language model APIs (OpenAI, Anthropic Claude, Google Gemini) and vector databases (Pinecone, Weaviate) for search, assistants, summarization, and document workflows inside your product.
Need something connected?
Tell us what you want to link up — payments, a CRM, an AI model, or a legacy system — and we’ll map the cleanest way to integrate it.