---
title: "Integrations - Billwerkplus"
url: "https://docs.unified.to/integrations/billwerkplus"
description: "Build Billwerk+ integrations faster with our Unified API — Payments data, API key, real-time sync."
date: "2026-10-25T22:24:19.492Z"
updated: "2026-10-25T22:24:19.492Z"
---
![](https://api.unified.to/docs/images/billwerkplus.png)

# Billwerk+ integration

[Back to integrations](https://docs.unified.to/integrations.md)

#### Overview

Company website:

<https://www.billwerk.com>

Integration launch date:

October 15, 2026

API Categories:

[Payments](https://docs.unified.to/payment/overview.md)[Accounting](https://docs.unified.to/accounting/overview.md)[Passthrough](https://docs.unified.to/passthrough/overview.md)

API Authorization:

 Private API key

#### ACCOUNTING CONTACT

End-API object:

 customer

Unified API Methods:

[List](https://docs.unified.to/accounting/contact/List%5Fall%5Fcontacts.md)[Get](https://docs.unified.to/accounting/contact/Retrieve%5Fa%5Fcontact.md)[Create](https://docs.unified.to/accounting/contact/Create%5Fa%5Fcontact.md)[Update](https://docs.unified.to/accounting/contact/Update%5Fa%5Fcontact.md)[Remove](https://docs.unified.to/accounting/contact/Remove%5Fa%5Fcontact.md)

List options:

limitoffsetquery

Readable fields:

[billing\_address](https://docs.unified.to/accounting/contact/model.md)[company\_name](https://docs.unified.to/accounting/contact/model.md)[created\_at](https://docs.unified.to/accounting/contact/model.md)[emails](https://docs.unified.to/accounting/contact/model.md)[first\_name](https://docs.unified.to/accounting/contact/model.md)[id](https://docs.unified.to/accounting/contact/model.md)[is\_active](https://docs.unified.to/accounting/contact/model.md)[is\_customer](https://docs.unified.to/accounting/contact/model.md)[last\_name](https://docs.unified.to/accounting/contact/model.md)[name](https://docs.unified.to/accounting/contact/model.md)[shipping\_address](https://docs.unified.to/accounting/contact/model.md)[tax\_number](https://docs.unified.to/accounting/contact/model.md)[telephones](https://docs.unified.to/accounting/contact/model.md)

Writable fields:

[billing\_address](https://docs.unified.to/accounting/contact/model.md)[company\_name](https://docs.unified.to/accounting/contact/model.md)[emails](https://docs.unified.to/accounting/contact/model.md)[first\_name](https://docs.unified.to/accounting/contact/model.md)[last\_name](https://docs.unified.to/accounting/contact/model.md)[shipping\_address](https://docs.unified.to/accounting/contact/model.md)[tax\_number](https://docs.unified.to/accounting/contact/model.md)[telephones](https://docs.unified.to/accounting/contact/model.md)

#### ACCOUNTING CREDITMEMO

End-API object:

 credit\_note

Unified API Methods:

[List](https://docs.unified.to/accounting/creditmemo/List%5Fall%5Fcreditmemoes.md)[Get](https://docs.unified.to/accounting/creditmemo/Retrieve%5Fa%5Fcreditmemo.md)

List options:

contact\_idlimitoffset

Readable fields:

[contact\_id](https://docs.unified.to/accounting/creditmemo/model.md)[created\_at](https://docs.unified.to/accounting/creditmemo/model.md)[creditmemo\_number](https://docs.unified.to/accounting/creditmemo/model.md)[currency](https://docs.unified.to/accounting/creditmemo/model.md)[id](https://docs.unified.to/accounting/creditmemo/model.md)[invoice\_id](https://docs.unified.to/accounting/creditmemo/model.md)[lineitems](https://docs.unified.to/accounting/creditmemo/model.md)[tax\_amount](https://docs.unified.to/accounting/creditmemo/model.md)[total\_amount](https://docs.unified.to/accounting/creditmemo/model.md)

Writable fields:

[\-none-](https://docs.unified.to/accounting/creditmemo/model.md)

#### ACCOUNTING INVOICE

End-API object:

 invoice

Unified API Methods:

[List](https://docs.unified.to/accounting/invoice/List%5Fall%5Finvoices.md)[Get](https://docs.unified.to/accounting/invoice/Retrieve%5Fan%5Finvoice.md)

List options:

contact\_idlimitoffset

Readable fields:

[cancelled\_at](https://docs.unified.to/accounting/invoice/model.md)[contact\_id](https://docs.unified.to/accounting/invoice/model.md)[created\_at](https://docs.unified.to/accounting/invoice/model.md)[currency](https://docs.unified.to/accounting/invoice/model.md)[discount\_amount](https://docs.unified.to/accounting/invoice/model.md)[due\_at](https://docs.unified.to/accounting/invoice/model.md)[id](https://docs.unified.to/accounting/invoice/model.md)[invoice\_number](https://docs.unified.to/accounting/invoice/model.md)[lineitems](https://docs.unified.to/accounting/invoice/model.md)[paid\_amount](https://docs.unified.to/accounting/invoice/model.md)[paid\_at](https://docs.unified.to/accounting/invoice/model.md)[refund\_amount](https://docs.unified.to/accounting/invoice/model.md)[status](https://docs.unified.to/accounting/invoice/model.md)[sub\_total\_amount](https://docs.unified.to/accounting/invoice/model.md)[tax\_amount](https://docs.unified.to/accounting/invoice/model.md)[total\_amount](https://docs.unified.to/accounting/invoice/model.md)[type](https://docs.unified.to/accounting/invoice/model.md)

Writable fields:

[\-none-](https://docs.unified.to/accounting/invoice/model.md)

#### PAYMENT PAYMENT

End-API object:

 transaction

Unified API Methods:

[List](https://docs.unified.to/payment/payment/List%5Fall%5Fpayments.md)

List options:

invoice\_idlimitoffset

Readable fields:

[allocations](https://docs.unified.to/payment/payment/model.md)[card\_brand](https://docs.unified.to/payment/payment/model.md)[card\_last4](https://docs.unified.to/payment/payment/model.md)[contact\_id](https://docs.unified.to/payment/payment/model.md)[created\_at](https://docs.unified.to/payment/payment/model.md)[currency](https://docs.unified.to/payment/payment/model.md)[id](https://docs.unified.to/payment/payment/model.md)[invoice\_id](https://docs.unified.to/payment/payment/model.md)[paid\_at](https://docs.unified.to/payment/payment/model.md)[payment\_method](https://docs.unified.to/payment/payment/model.md)[status](https://docs.unified.to/payment/payment/model.md)[tender\_type](https://docs.unified.to/payment/payment/model.md)[total\_amount](https://docs.unified.to/payment/payment/model.md)

Writable fields:

[\-none-](https://docs.unified.to/payment/payment/model.md)

#### PAYMENT PAYOUT

End-API object:

 payout

Unified API Methods:

[List](https://docs.unified.to/payment/payout/List%5Fall%5Fpayouts.md)[Get](https://docs.unified.to/payment/payout/Retrieve%5Fa%5Fpayout.md)

List options:

limitoffset

Readable fields:

[arrival\_at](https://docs.unified.to/payment/payout/model.md)[created\_at](https://docs.unified.to/payment/payout/model.md)[currency](https://docs.unified.to/payment/payout/model.md)[id](https://docs.unified.to/payment/payout/model.md)[notes](https://docs.unified.to/payment/payout/model.md)[status](https://docs.unified.to/payment/payout/model.md)[total\_amount](https://docs.unified.to/payment/payout/model.md)

Writable fields:

[\-none-](https://docs.unified.to/payment/payout/model.md)

#### PAYMENT SUBSCRIPTION

End-API object:

 subscription

Unified API Methods:

[List](https://docs.unified.to/payment/subscription/List%5Fall%5Fsubscriptions.md)[Get](https://docs.unified.to/payment/subscription/Retrieve%5Fa%5Fsubscription.md)

List options:

contact\_idlimitoffset

Readable fields:

[canceled\_at](https://docs.unified.to/payment/subscription/model.md)[contact\_id](https://docs.unified.to/payment/subscription/model.md)[created\_at](https://docs.unified.to/payment/subscription/model.md)[currency](https://docs.unified.to/payment/subscription/model.md)[current\_period\_end\_at](https://docs.unified.to/payment/subscription/model.md)[current\_period\_start\_at](https://docs.unified.to/payment/subscription/model.md)[end\_at](https://docs.unified.to/payment/subscription/model.md)[id](https://docs.unified.to/payment/subscription/model.md)[start\_at](https://docs.unified.to/payment/subscription/model.md)[status](https://docs.unified.to/payment/subscription/model.md)[total\_amount](https://docs.unified.to/payment/subscription/model.md)

Writable fields:

[\-none-](https://docs.unified.to/payment/subscription/model.md)

#### PASSTHROUGH

Unified API Methods:

[POST](https://docs.unified.to/passthrough/overview.md)[GET](https://docs.unified.to/passthrough/overview.md)[PUT](https://docs.unified.to/passthrough/overview.md)[DELETE](https://docs.unified.to/passthrough/overview.md)

List options:

\-none-

Readable fields:

[\-none-](https://docs.unified.to/passthrough/undefined/model.md)

Writable fields:

[\-none-](https://docs.unified.to/passthrough/undefined/model.md)