AppexTECHNOLOGY

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.

Custom connections

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.

Integrations

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

StripePayPalSquareBraintreeAdyenPlaidChargebeeRecurlyBill.com

CRM & Sales

SalesforceHubSpotPipedriveZoho CRMTwentyClose

Email, SMS & Messaging

SendGridResendPostmarkMailgunMailchimpKlaviyoCustomer.ioTwilioSlackMicrosoft TeamsDiscord

E-commerce

ShopifyWooCommerceBigCommerceMedusaStripe Checkout

Accounting & Finance

QuickBooksXeroNetSuitePlaidStripe Billing

AI & LLMs

OpenAIAnthropic (Claude)Google GeminiMistralHugging FacePineconeWeaviateQdrant

Auth & Identity

Auth0ClerkOktaKeycloakGoogle SSOMicrosoft Entra IDOAuth 2.0SAML / OIDC

Cloud & Storage

AWSGoogle CloudMicrosoft AzureCloudflareAmazon S3Cloudflare R2Google DriveDropbox

Analytics & Data

Google AnalyticsPostHogSegmentMixpanelBigQuerySnowflake

Calendar & Scheduling

Google CalendarMicrosoft 365Cal.comCalendly

Maps & Location

Google MapsMapbox

Documents & E-signature

DocuSignDocumensoGoogle Workspace

Productivity & Ops

NotionAirtableJiraLinearGoogle WorkspaceMicrosoft 365

Shipping & Logistics

ShippoEasyPostShipStation

Support & Help Desk

ZendeskIntercomChatwootFreshdesk
FAQ

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.

Start a projectinfo@appextechnology.com