API.1

One integration. A bigger market.

Turn accounting data into your next great product. API.1 connects you to multiple accounting systems through one unified schema, so you can spend more time building and less time maintaining integrations.

Read the API docs Start your 14-day free trial

Accounting data flows from accounting systems through Zwapgrid into invoices, payments, transactions, balance sheets and journals, delivered through one API.

From customer consent to accounting data.

Once your customer connects their accounting system and accepts consent, retrieve sales invoices through API.1.

Request · cURL

curl "https://apione.zwapgrid.com/accounting/api/v1/consents/${CONSENT_ID}/salesinvoices?Count=10&CurrentPage=1" \
  -H "x-api-key: ${API_KEY}" \
  -H "x-correlation-id: $(uuidgen)"

Use your API key and accepted consent ID. Generate a unique correlation ID for each request. Run server-side.

Sample response · JSON

{
  "data": [
    {
      "id": "INV-001",
      "issueDate": "2024-03-15",
      "totalBalanceAmount": {
        "amount": 1250,
        "currencyId": "SEK"
      }
    }
  ]
}

Documentation example, shortened to show selected fields.

Operation and field availability vary by accounting system.

Explore the API reference →

Consent & authentication

We handle customer onboarding, accounting-system authentication and token refresh.

Harmonized data

Work with a common data model. We maintain the connectors as source systems change.

Your product, your control

Choose when to fetch data and how your product uses it. Trace requests with correlation IDs.

Check your integration fit.

See what your accounting system supports, then test the workflow you need.

Explore coverage by system and operation

“Contact us” means the reference marks the operation as not supported / contact us. It does not promise availability.

Selected operations from our API coverage
System	Onboarding	Read sales invoices	Read supplier invoices	Read trial balances	Create journals
Billy	Supported	Supported	Supported	Supported	Supported
Bjorn Lunden	Supported	Supported	Supported	Supported	Supported
Bokio	Supported	Supported	Supported	Contact us	Contact us
Exact Online	Supported	Supported	Contact us	Contact us	Contact us
Fortnox	Supported	Supported	Supported	Supported	Supported
Microsoft Business Central	Supported	Supported	Supported	Contact us	Contact us
Procountor	Supported	Supported	Supported	Supported	Supported
QuickBooks	Supported	Supported	Contact us	Contact us	Contact us
Spiris	Supported	Supported	Supported	Supported	Supported
Tripletex	Supported	Contact us	Contact us	Contact us	Supported
Visma Dinero	Supported	Supported	Contact us	Supported	Supported
Visma Netvisor	Supported	Supported	Supported	Supported	Contact us
Visma e-conomic	Supported	Supported	Supported	Supported	Supported
Xero	Supported	Supported	Supported	Contact us	Supported

This is a selection, not the full API. Field support, filters and test data coverage can differ. Check the full API Coverage →

How your integration runs

Create consent, complete customer onboarding, then poll the Consent API until accepted. Fetch accounting data using the consent ID, your API key and a unique correlation ID. The sales invoice list supports pagination with Count and CurrentPage.

Authentication and polling →

Start in development, validate before production

Use a Development API key and Development consents. TEST.1 provides sample data for a number of endpoints. Validate your required operations and target systems before switching to Production keys and consents.

Development environment → · Start your 14-day free trial

Need native system endpoints? Explore Proxy.1. Need to ingest invoices from files? Explore File.1.