REST API • OAuth 2.0 • Webhooks

Build on SyncBooks

Access accounting, invoicing, payroll, inventory, and CRM data through a powerful REST API. Build integrations that connect SyncBooks to your tools.

# Fetch invoices with a single API call

curl https://api.syncbooks.com/api/v1/invoices \

-H "Authorization: Bearer sk_live_your_key"

# Response

{

"data": [{ "id": "inv_001", "total": 1500, "status": "paid" }],

"total": 42, "page": 1

}

Everything you need to integrate

Generate secret keys with granular scopes. Authenticate in seconds with a Bearer token.

Build apps that act on behalf of users. Full Authorization Code flow with refresh token rotation.

Get real-time notifications when events happen. HMAC-signed payloads with automatic retries.

Access every module in SyncBooks programmatically

Invoices

Expenses

Bills

Payments

Customers

Vendors

Products

Inventory

Payroll

Employees

Journal Entries

Bank Transactions

Fixed Assets

Projects

Budgets

Reports

Create a free SyncBooks account and get your API key in under a minute.