---
title: Twinfield integration
description: "Connect Twinfield to OWNER: how to set up the integration, what's exchanged, and answers to frequently asked questions about sales invoices and payments."
---
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October 20, 2026
# Twinfield integration
## Exchanging sales invoices, relations and payments with Twinfield
With the Twinfield integration, OWNER automatically sends your sales invoices and relations to your Twinfield administration, and payments you match to a sales invoice in Twinfield automatically come back to OWNER. In this article, you'll read how to set up the integration and how to work with it day to day, and you'll find answers to frequently asked questions.
**Prefer to keep everything in OWNER?** With [OWNER Wallet](https://knowledge.owner.app/en/what-is-owner-wallet?hsLang=en) (expected late 2026), you receive payments in your own bank account in OWNER and they're processed automatically. Read [OWNER Wallet or accounting integration: which suits you?](https://knowledge.owner.app/en/owner-wallet-or-accounting-integration?hsLang=en)
**In this article**
1. [What does the integration do?](https://knowledge.owner.app/en/twinfield#wat-doet-de-koppeling)
2. [Before you start](https://knowledge.owner.app/en/twinfield#voordat-je-begint)
3. [How to set up the integration](https://knowledge.owner.app/en/twinfield#koppeling-instellen)
4. [Working with the integration day to day](https://knowledge.owner.app/en/twinfield#dagelijks-werken)
5. [Frequently asked questions](https://knowledge.owner.app/en/twinfield#veelgestelde-vragen)
- [Connecting and setting up](https://knowledge.owner.app/en/twinfield#faq-koppelen)
- [Exchanging sales invoices](https://knowledge.owner.app/en/twinfield#faq-verkoopfacturen)
- [Relations and debtors](https://knowledge.owner.app/en/twinfield#faq-relaties)
- [Payments](https://knowledge.owner.app/en/twinfield#faq-betalingen)
## What does the integration do?
| Section | Direction | How often |
| --- | --- | --- |
| Sales invoices | OWNER → Twinfield | Every 15 minutes (automatically) or when you submit them |
| Relations (debtors) | OWNER → Twinfield | With the first sales invoice, then daily at 12:00 UTC |
| Payment status | Twinfield → OWNER | Every 15 minutes |
## Before you start
- **Access to Twinfield** with a user who won't be deleted or blocked any time soon; the integration is tied to that user.
- **General ledger accounts and VAT codes** are already set up in Twinfield. You decide which account belongs to which sales item, on your own or together with your accountant.
## How to set up the integration
### Step 1 – Install Twinfield in OWNER
1. Go to **Settings** and, in the environment settings, open **Connected apps**.
2. In the marketplace, choose **Twinfield** and click **Install**.
3. Log in to Twinfield with the user from [Before you start](https://knowledge.owner.app/en/twinfield#voordat-je-begint).
### Step 2 – Link owners to administrations
1. Assign each owner in OWNER to the right administration in Twinfield.
2. Multiple owners? Link an extra administration at the top, next to the Twinfield logo, via **Connect administration**.
### Step 3 – Choose your settings per administration
In the integration, open **Settings** at the top.
**General tab**
| Setting | What it does |
| --- | --- |
| **Sales journal** | The sales journal in which the sales invoices are posted. |
| **Book invoices automatically** | On: all sales invoices for this owner are sent to Twinfield automatically. Off: you choose which sales invoices to submit. |
**Other tabs**
| Tab | What you link here |
| --- | --- |
| **Ledger Accounts** | Sales items in OWNER to general ledger accounts in Twinfield. *Required* for every sales item you use in this administration. |
| **Vat Codes** | VAT codes in OWNER to VAT codes in Twinfield. |
Done? Then the integration works right away.
## Working with the integration day to day
In the integration, you'll find **Invoices** at the top. There you work with two overviews:
- **Unsynced** – sales invoices that haven't been sent to Twinfield yet. Select them and click the **Play** icon to submit them manually.
- **Failed** – sales invoices that got stuck because of an error message. Check here regularly.
**Note:** if you turn on **Book invoices automatically** later, all sales invoices still under **Unsynced** are also sent to Twinfield immediately.
## Frequently asked questions
### Connecting and setting up
#### Which other accounting packages can I connect?
Exact Online, AFAS, Twinfield, SnelStart and Multivers. See [Which accounting packages can you connect to OWNER?](https://knowledge.owner.app/en/accounting-integrations?hsLang=en)
[↑ Back to the questions](https://knowledge.owner.app/en/twinfield#veelgestelde-vragen)
### Exchanging sales invoices
#### How long does it take for a sales invoice to appear in Twinfield?
If **Book invoices automatically** is on, sales invoices are sent to Twinfield every 15 minutes, at fixed times such as 10:00, 10:15, 10:30 and 10:45. If the option is off, you submit them yourself via **Invoices** → **Unsynced** and the **Play** icon.
#### A sales invoice isn't being exchanged. How do I fix that?
Do you see the message *“This sales invoice could not be exchanged with the accounting package”*? Open the integration and check under **Invoices** → **Failed** which error message is shown. The most common cause is a sales item without a ledger account (see the next question). Still stuck? Send support the exact text of the error message.
#### Why is a sales invoice stuck because of a missing ledger account?
A sales invoice is only sent to Twinfield if *every* sales item on it is linked to a ledger account.
1. Open the integration, click **Settings** and go to **Ledger Accounts**.
2. Find the sales item without a ledger account and link the right account.
3. Submit the sales invoice again via **Invoices** → **Failed**.
Tips for creating a sales invoice:
- Always choose a real sales item, such as base rent, with a linked ledger account.
- Is it a credit, refund or down payment? Put that in the title or subject, not in the sales item.
- Manual sales invoice for a rent discount? Choose **Rent** as the sales item.
#### Can I create a sales invoice with an invoice date in the past?
No. This is deliberately not supported, because the financial period in your accounting package may already be closed.
[↑ Back to the questions](https://knowledge.owner.app/en/twinfield#veelgestelde-vragen)
### Relations and debtors
#### How often are relations updated in Twinfield?
Once a day, at 12:00 UTC (14:00 Dutch summer time, 13:00 winter time). The update goes from OWNER to Twinfield, so always change the name, email address and phone number in OWNER.
#### Why isn't a tenant listed as a debtor in Twinfield yet?
A tenant is only created as a debtor with their first sales invoice. You don't need to do anything for this. If creating the debtor fails, check the error message under **Invoices** → **Failed**.
[↑ Back to the questions](https://knowledge.owner.app/en/twinfield#veelgestelde-vragen)
### Payments
#### How does a payment from Twinfield come back to OWNER?
In Twinfield, match the payment to the sales invoice. Within 15 minutes, the integration picks this up and OWNER marks the sales invoice as paid (for a full payment). Only payments matched to the sales invoice in Twinfield come back.
#### Can I record a partial payment or a payment outside Twinfield?
You don't record partial payments manually in OWNER; they come in via the integration. Was a sales invoice paid outside OWNER and outside Twinfield? Open the sales invoice and choose **Actions** → **Change status** → **Change payment status** → **Paid outside OWNER**. See also [How do I manually mark a sales invoice as paid?](https://knowledge.owner.app/en/mark-sales-invoice-as-paid?hsLang=en)
[↑ Back to the questions](https://knowledge.owner.app/en/twinfield#veelgestelde-vragen)
## Still need help?
Contact support:
- **Chat:** via the [help center](https://owner.app/help?hsLang=en) (chat button in the bottom right)
- **Email:** [support@owner.app](mailto:support@owner.app)
- **Call or WhatsApp:** [+31 591 799 602](tel:+31591799602)
- [Working with OWNER](https://knowledge.owner.app/en/working-with-owner?hsLang=en)
- [Frequently Asked Questions](https://knowledge.owner.app/en/frequently-asked-questions?hsLang=en)
- [Tips](https://knowledge.owner.app/en/tips?hsLang=en)
- [Connections](https://knowledge.owner.app/en/connections?hsLang=en)
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