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OneBooks Developer Platform

Build the app merchants install inside OneBooks

OAuth 2.0 APIs, real-time events, embedded app pages, app data and hosted functions — discoverable in a marketplace that reaches every OneBooks business. Every plan, Free included, has full API access, and you keep 100% of what you charge.

Start buildingRead the docs
post a journal entry
$ curl -X POST https://api.getonebooks.com/journal \
    -H "Authorization: Bearer $TOKEN" \
    -H "Content-Type: application/json" \
    -d '{
      "date": "2026-08-12",
      "description": "Owner investment",
      "lines": [
        { "accountCode": "1200", "debit":  5000 },
        { "accountCode": "3000", "credit": 5000 }
      ]
    }'

HTTP/2 201
{
  "journalNumber": "JE-00042",
  "lines": [
    { "accountCode": "1200", "debit": 5000, "credit": 0 },
    { "accountCode": "3000", "debit": 0, "credit": 5000 }
  ]
}

From embedded iframe to ledger data

Your embedded app already holds a session token from App Bridge. Exchange it for an access token, then call the API — no redirect, no SDK required.

1 · exchange a session token for an access token
curl -X POST https://api.getonebooks.com/oauth/token \
  -u "YOUR_CLIENT_ID:YOUR_CLIENT_SECRET" \
  -d grant_type=urn:ietf:params:oauth:grant-type:token-exchange \
  -d subject_token=SESSION_TOKEN \
  -d subject_token_type=urn:ietf:params:oauth:token-type:jwt
2 · call the API
curl https://api.getonebooks.com/invoices \
  -H "Authorization: Bearer ACCESS_TOKEN"
OAuth 2.0 + PKCEStandards-based authorization with granular scopes.Embedded appsShip a page that opens inside OneBooks, secured by short-lived session tokens.App dataTyped fields on invoices, customers and more — never part of the ledger.MarketplaceList once, reach every OneBooks business — keep 100% of the revenue.Webhooks & eventsHMAC-signed deliveries plus a 30-day catch-up log, for every document and app change.Hosted functionsRun your own JavaScript on OneBooks events, sandboxed — no server to operate.SandboxProvision disposable test businesses from the console.