How do I integrate Fiken API with my application?

Apideck provides a unified Accounting API that makes Fiken integration simple. Sign up for free, enable Fiken in your dashboard, and use our Vault component to let your users connect their Fiken accounts. We handle OAuth authentication, token refresh, and data normalization automatically.

What Fiken data can I access through Apideck?

Our Fiken integration supports 23+ data models including companies, company, tax rates, and sales. You can perform read and write operations through our unified API, working with the same code structure across all accounting platforms.

How does Fiken authentication work with Apideck?

Apideck's Vault handles Fiken authentication completely. Your users connect their Fiken accounts through our secure, white-label UI. We manage OAuth tokens, automatic refresh, and credential storage, so you never have to implement Fiken's auth flow yourself.

Does Apideck support Fiken webhooks?

Yes, Apideck provides real-time notifications when Fiken data changes. Our unified webhook system normalizes events across all integrations, so you handle Fiken events with the same code you use for other accounting platforms.

Why use Apideck instead of Fiken's direct API?

Using Apideck's unified API instead of Fiken's direct API saves significant development time. You get normalized data models, automatic auth handling, and the same integration code works with 200+ other apps. When Fiken updates their API, we handle the changes so your integration keeps working.

How quickly can I build a Fiken integration?

Most developers ship a working Fiken integration within a day using Apideck. Sign up for a free trial (no credit card required), enable Fiken, and make your first API call within minutes. Our SDKs for Node.js, Python, and other languages make implementation straightforward.

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Fiken API integration

Build Fiken integrations in minutes, not months. One API to sync permissioned accounting data with Fiken and 55+ other apps.

Last updated October 29, 2026

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23+ data models

SOC 2 certified

Free trial

Real-time webhooks

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Your customers authorize exactly which data your app can access.

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Integration Guide

How to integrate Fiken API in 3 steps

Build a production-ready Fiken Accounting API integration in minutes, not months. No OAuth headaches, no maintenance burden.

Step 01

Create your Apideck account

Start your free trial
Full API access
No credit card required

Step 02

Connect Fiken via Vault

Use our pre-built Vault component to let your users securely connect their Fiken account. We handle OAuth, token refresh, and credential storage.

White-label auth UI
Automatic token refresh
SOC 2 certified

Step 03

Start syncing accounting data

Make API calls to read and write accounting data from Fiken. Use the same code to connect 200+ other apps.

Normalized data models
Real-time webhooks
Full CRUD support

Start Fiken integration

Free trial • No credit card required • Setup in under 5 minutes

Code Example

Fiken API integration code

Integrate Fiken with just a few lines of code. Our unified Accounting API normalizes data across 200+ integrations, so you write once and connect everywhere.

Normalized responses — same data structure for all accounting apps
Official SDKs — Node.js, Python, and more with TypeScript support
Full documentation — interactive API reference with Fiken-specific examples

View Fiken API documentation →

import { Apideck } from '@apideck/unify'

const apideck = new Apideck({
  apiKey: process.env.APIDECK_API_KEY,
  appId: process.env.APIDECK_APP_ID,
  consumerId: 'user-123'
})

// List invoices from Fiken
const { data } = await apideck.accounting.invoices.list({
  serviceId: 'fiken'
})

console.log(`Found ${data.length} invoices`)

Explore all SDKs ↓

Why integrate Fiken with Apideck?

Build a production-ready Fiken integration with enterprise-grade reliability

Ship Fiken integration fast

Go live with Fiken in days, not months. Our unified Accounting API handles authentication, data normalization, and error handling so your team can focus on building features.

23+ Fiken data models

Access 23+ data models for Fiken including companies, customers and invoices. Read and write data through a single standardized API.

Real-time webhook coverage

Keep your product synchronized with Fiken using webhooks. Receive push updates for invoices, customers, payments, and more without polling.

Get started for free

Technical Specifications

Fiken API integration details

Everything you need to know about integrating Fiken through our unified Accounting API.

Authentication

OAuth 2.0

Secure token-based authentication

Data Models

23+ resources

Access 23+ normalized data models

Webhooks

Virtual webhooks

Real-time data sync on changes

Security

SOC 2 Type II

Enterprise-grade security certified

Token Management

Automatic refresh

Never worry about expired tokens

API Format

REST + JSON

Standard REST API with JSON responses

Fiken direct API vs Apideck unified API

Feature	Direct Fiken API	Apideck Unified API
OAuth implementation	Build from scratch	Handled by Vault
Token refresh	Manual handling	Automatic
Data normalization	Fiken format only	Normalized across 200+ apps
Error handling	Platform-specific	Unified error codes
Rate limit management	DIY implementation	Built-in throttling
Maintenance	Ongoing updates required	We handle API changes
Additional integrations	Separate work each	Same code, 200+ apps

View complete Fiken API reference →

Use Cases

What integrations can you build with Fiken?

Power these accounting workflows with Fiken data through our unified API.

Accounts Payable

Sync vendor bills, approvals & payments across accounting systems in real time.

Learn more

Accounts Receivable

Push invoices, payment statuses & credits into users' ledgers.

Learn more

Payment Reconciliation

Match payments to invoices and bank transactions across accounting systems for automated, real-time reconciliation.

Learn more

Payroll Accounting

Streamline payroll data flow between HR systems and accounting platforms seamlessly.

Learn more

Tax Automation

Connect to accounting data to accurately calculate, file, and reconcile sales tax.

Learn more

View all use cases

Fiken Integration FAQ

Common questions about integrating Fiken with your application

Learn more about Fiken

More Accounting API connectors ⚡️

We build and maintain connectors, so you don't have to. View our full list of Accounting connectors.
Missing a connector? We're able to add new connectors.

Access Financials

Fiken API integration

Requested Data Access

Trusted by fast-moving product & engineering teams

How to integrate Fiken API in 3 steps

Create your Apideck account

Connect Fiken via Vault

Start syncing accounting data

Fiken API integration code

Why integrate Fiken with Apideck?

Ship Fiken integration fast

23+ Fiken data models

Real-time webhook coverage

Push and pull Fiken data

Accounts

Tax Rates

Company

Invoices

Contacts Customers

Purchases

Contacts Suppliers

Products

Payments

Credit Notes

Account Balances

Journal Entries

Attachments

Projects Tracking Categories

Bill Payments

Offers

Order Confirmations

Bank Accounts

Projects

Bank Accounts Payment Methods

Sales

Companies

Transactions

Fiken API integration details

Fiken direct API vs Apideck unified API

What integrations can you build with Fiken?

Accounts Payable

Accounts Receivable

Payment Reconciliation

Payroll Accounting

Tax Automation

Fiken Integration FAQ

Learn more about Fiken

More Accounting API connectors ⚡️

Fiken SDKs

Fiken MCP Server

Fiken Apideck CLI

Fiken Node.js SDK

Fiken TypeScript SDK

Fiken PHP SDK

Fiken .NET

Fiken Python SDK

Fiken Java SDK

Fiken Go SDK

More ways to integrate Fiken

MCP Server

CLI

API Skills

Launch accounting integrations in weeks, not months