# Apideck > Apideck is a unified API platform. Integrate once to connect to > 200+ services across CRM, Accounting, HRIS, ATS, File Storage, > E-commerce, Issue Tracking, and more. - [Markdown index](https://developers.apideck.com/md/index.json): Machine-readable index of all available markdown documentation - [OpenAPI specs](https://github.com/apideck-libraries/openapi-specs): Open-source OpenAPI specifications for all Apideck APIs - [API Skills](https://github.com/apideck-libraries/api-skills): Agent skills that teach LLMs to build with Apideck SDKs ## Docs - [Get Started](https://developers.apideck.com/get-started): Create an account, get API keys, and make your first API call - [Building with LLMs](https://developers.apideck.com/building-with-llms): API skills, IDE plugins, and plain-text docs - [API Explorer](https://developers.apideck.com/api-explorer): Interactive API explorer to test endpoints ## Unified APIs - [CRM API](https://developers.apideck.com/apis/crm/reference): Contacts, companies, opportunities, leads, pipelines - [Accounting API](https://developers.apideck.com/apis/accounting/reference): Invoices, bills, payments, ledger accounts, tax rates - [HRIS API](https://developers.apideck.com/apis/hris/reference): Employees, departments, time off, payroll - [ATS API](https://developers.apideck.com/apis/ats/reference): Jobs, applicants, hiring pipelines - [File Storage API](https://developers.apideck.com/apis/file-storage/reference): Files, folders, shared links - [E-commerce API](https://developers.apideck.com/apis/ecommerce/reference): Orders, products, customers - [Issue Tracking API](https://developers.apideck.com/apis/issue-tracking/reference): Issues, projects, comments ## Platform APIs - [Vault API Reference](https://developers.apideck.com/apis/vault/reference): Manage connections, sessions, and consumer authentication - [Webhooks API Reference](https://developers.apideck.com/apis/webhook/reference): Subscribe to events and receive real-time updates - [Proxy API Reference](https://developers.apideck.com/apis/proxy/reference): Make direct calls to downstream APIs through Apideck - [Connector API Reference](https://developers.apideck.com/apis/connector/reference): Query available connectors, resources, and coverage ## SDKs - [TypeScript / Node.js SDK](https://developers.apideck.com/sdks/node): Install with `npm install @apideck/unify` - [Python SDK](https://developers.apideck.com/sdks/python): Install with `pip install apideck-unify` - [C# / .NET SDK](https://developers.apideck.com/sdks/dot-net): Install with `dotnet add package ApideckUnifySdk` - [PHP SDK](https://developers.apideck.com/sdks/php): Install with `composer require apideck-libraries/sdk-php` - [Java SDK](https://developers.apideck.com/sdks/java): Install with `implementation 'com.apideck:unify'` - [Go SDK](https://developers.apideck.com/sdks/go): Install with `go get github.com/apideck-libraries/sdk-go` ## Guides - [Vault JS](https://developers.apideck.com/guides/vault): Embed the Vault integration UI in your app with JavaScript, React, or Vue - [Webhooks](https://developers.apideck.com/guides/webhooks): Set up native and virtual webhooks for real-time updates from Unified APIs - [Webhook Signature Verification](https://developers.apideck.com/guides/webhook-signature-verification): Verify webhook signatures to prevent tampering - [Field Mapping](https://developers.apideck.com/guides/field-mapping): Extend Apideck models and map custom fields from integrations - [Unified Pass Through](https://developers.apideck.com/guides/pass-through): Send connector-specific parameters outside the unified model - [Vault Connection States](https://developers.apideck.com/guides/connection-states): Understand and handle the lifecycle of Vault connections - [Authorize Connections](https://developers.apideck.com/guides/authorize-connections): Different methods for authorizing consumer connections - [Unified Rate Limits](https://developers.apideck.com/guides/unified-rate-limits): Handle rate limit headers returned by Unified APIs - [Getting Downstream Responses](https://developers.apideck.com/guides/using-raw-mode): Get raw responses from downstream APIs - [File Picker](https://developers.apideck.com/guides/file-picker): Add a file browser and uploader component to your app - [Uploading Files](https://developers.apideck.com/guides/file-upload): Upload files to Google Drive, Box, SharePoint, OneDrive, and Dropbox - [Migrating Integrations](https://developers.apideck.com/guides/migrating-integrations): Migrate credentials from existing integrations to Apideck - [SDK Migration](https://developers.apideck.com/guides/sdk-migration): Migrate from legacy @apideck/node to the new @apideck/unify SDKs - [Mark Invoices as Paid](https://developers.apideck.com/guides/mark-invoices-as-paid): Record payments against invoices and bills - [Expenses and Bills](https://developers.apideck.com/guides/expenses-bills): Handle expenses and bills across accounting connectors - [Tracking Dimensions](https://developers.apideck.com/guides/locations-subsidiaries-departments): Use departments, locations, and subsidiaries for segmented reporting - [Xero Bank Feeds](https://developers.apideck.com/guides/bank-feeds-xero): Send transaction data into Xero for reconciliation - [Push Applicant to HRIS](https://developers.apideck.com/guides/sync-applicant): Sync hired applicants from ATS to HRIS - [Onboard and Offboard Employees](https://developers.apideck.com/guides/onboard-and-offboard-employees-hris-api): Automate employee sync from HRIS - [Data Scopes for Accounting](https://developers.apideck.com/guides/data-scopes-for-accounting): Control field-level access for accounting data - [Data Scopes for HRIS](https://developers.apideck.com/guides/data-scopes-for-hris): Control field-level access for HRIS data - [Refresh Token Race Condition](https://developers.apideck.com/guides/refresh-token-race-condition): Handle OAuth token refresh conflicts ## Optional - [Connectors](https://developers.apideck.com/connectors): Browse all 200+ supported connectors and their capabilities - [Samples](https://developers.apideck.com/samples): Open-source sample projects and integration examples - [Changelog](https://developers.apideck.com/changelog): Latest updates and changes to the API - [API Status](https://status.apideck.com): Real-time API status and incident history