---
title: "Integrations - Sellsy"
url: "https://docs.unified.to/integrations/sellsy"
description: "Build Sellsy integrations faster with our Unified API — Accounting data, OAuth2, real-time sync."
date: "2026-10-01T23:34:56.864Z"
updated: "2026-10-25T22:24:19.492Z"
---
![](https://api.unified.to/docs/images/sellsy.png)

# Sellsy integration

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

#### Overview

Company website:

<https://www.sellsy.com>

Integration launch date:

August 8, 2026

API Categories:

[Accounting](https://docs.unified.to/accounting/overview.md)[E-Commerce](https://docs.unified.to/commerce/overview.md)[Payments](https://docs.unified.to/payment/overview.md)[HR & Directory](https://docs.unified.to/hris/overview.md)[Passthrough](https://docs.unified.to/passthrough/overview.md)

API Authorization:

 OAuth2 flow

#### ACCOUNTING CONTACT

End-API object:

 company individual

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)

Webhooks:

 Native

List options:

limitoffset

Readable fields:

[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)[identification](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)[is\_supplier](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)[telephones](https://docs.unified.to/accounting/contact/model.md)[updated\_at](https://docs.unified.to/accounting/contact/model.md)

Writable fields:

[name](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)[identification](https://docs.unified.to/accounting/contact/model.md)[is\_supplier](https://docs.unified.to/accounting/contact/model.md)[telephones](https://docs.unified.to/accounting/contact/model.md)

 required fields 

#### 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)

Webhooks:

 Native

List options:

limitoffset

Readable fields:

[balance\_amount](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)[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)[notes](https://docs.unified.to/accounting/invoice/model.md)[paid\_amount](https://docs.unified.to/accounting/invoice/model.md)[posted\_at](https://docs.unified.to/accounting/invoice/model.md)[status](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)[url](https://docs.unified.to/accounting/invoice/model.md)

Writable fields:

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

#### ACCOUNTING QUOTE

End-API object:

 estimate

Unified API Methods:

[List](https://docs.unified.to/accounting/quote/List%5Fall%5Fquotes.md)[Get](https://docs.unified.to/accounting/quote/Retrieve%5Fa%5Fquote.md)

Webhooks:

 Native

List options:

limitoffset

Readable fields:

[contact\_id](https://docs.unified.to/accounting/quote/model.md)[created\_at](https://docs.unified.to/accounting/quote/model.md)[currency](https://docs.unified.to/accounting/quote/model.md)[expires\_at](https://docs.unified.to/accounting/quote/model.md)[id](https://docs.unified.to/accounting/quote/model.md)[issued\_at](https://docs.unified.to/accounting/quote/model.md)[quote\_number](https://docs.unified.to/accounting/quote/model.md)[status](https://docs.unified.to/accounting/quote/model.md)[sub\_total\_amount](https://docs.unified.to/accounting/quote/model.md)[tax\_amount](https://docs.unified.to/accounting/quote/model.md)[title](https://docs.unified.to/accounting/quote/model.md)[total\_amount](https://docs.unified.to/accounting/quote/model.md)[url](https://docs.unified.to/accounting/quote/model.md)

Writable fields:

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

#### ACCOUNTING CREDITMEMO

End-API object:

 creditnote

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)

Webhooks:

 Native

List options:

limitoffset

Readable fields:

[balance\_amount](https://docs.unified.to/accounting/creditmemo/model.md)[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)[notes](https://docs.unified.to/accounting/creditmemo/model.md)[paid\_amount](https://docs.unified.to/accounting/creditmemo/model.md)[posted\_at](https://docs.unified.to/accounting/creditmemo/model.md)[status](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 ORDER

End-API object:

 order

Unified API Methods:

[List](https://docs.unified.to/accounting/order/List%5Fall%5Forders.md)[Get](https://docs.unified.to/accounting/order/Retrieve%5Fan%5Forder.md)

Webhooks:

 Native

List options:

limitoffset

Readable fields:

[contact\_id](https://docs.unified.to/accounting/order/model.md)[created\_at](https://docs.unified.to/accounting/order/model.md)[currency](https://docs.unified.to/accounting/order/model.md)[id](https://docs.unified.to/accounting/order/model.md)[posted\_at](https://docs.unified.to/accounting/order/model.md)[status](https://docs.unified.to/accounting/order/model.md)[total\_amount](https://docs.unified.to/accounting/order/model.md)[type](https://docs.unified.to/accounting/order/model.md)

Writable fields:

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

#### COMMERCE ITEM

End-API object:

 item

Unified API Methods:

[List](https://docs.unified.to/commerce/item/List%5Fall%5Fitems.md)[Get](https://docs.unified.to/commerce/item/Retrieve%5Fan%5Fitem.md)

Webhooks:

 Native

List options:

limitoffset

Readable fields:

[account\_id](https://docs.unified.to/commerce/item/model.md)[description](https://docs.unified.to/commerce/item/model.md)[global\_code](https://docs.unified.to/commerce/item/model.md)[id](https://docs.unified.to/commerce/item/model.md)[is\_active](https://docs.unified.to/commerce/item/model.md)[name](https://docs.unified.to/commerce/item/model.md)[prices](https://docs.unified.to/commerce/item/model.md)[taxrate\_id](https://docs.unified.to/commerce/item/model.md)[type](https://docs.unified.to/commerce/item/model.md)

Writable fields:

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

#### PAYMENT PAYMENT

End-API object:

 payment

Unified API Methods:

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

List options:

limitoffset

Readable fields:

[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)[notes](https://docs.unified.to/payment/payment/model.md)[payment\_method](https://docs.unified.to/payment/payment/model.md)[reference](https://docs.unified.to/payment/payment/model.md)[total\_amount](https://docs.unified.to/payment/payment/model.md)[type](https://docs.unified.to/payment/payment/model.md)

Writable fields:

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

#### ACCOUNTING TAXRATE

End-API object:

 tax

Unified API Methods:

[List](https://docs.unified.to/accounting/taxrate/List%5Fall%5Ftaxrates.md)[Get](https://docs.unified.to/accounting/taxrate/Retrieve%5Fa%5Ftaxrate.md)

List options:

limitoffset

Readable fields:

[id](https://docs.unified.to/accounting/taxrate/model.md)[is\_active](https://docs.unified.to/accounting/taxrate/model.md)[name](https://docs.unified.to/accounting/taxrate/model.md)[rate](https://docs.unified.to/accounting/taxrate/model.md)

Writable fields:

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

#### HRIS EMPLOYEE

End-API object:

 staff

Unified API Methods:

[List](https://docs.unified.to/hris/employee/List%5Fall%5Femployees.md)[Get](https://docs.unified.to/hris/employee/Retrieve%5Fan%5Femployee.md)

List options:

limitoffset

Readable fields:

[emails](https://docs.unified.to/hris/employee/model.md)[employment\_status](https://docs.unified.to/hris/employee/model.md)[first\_name](https://docs.unified.to/hris/employee/model.md)[id](https://docs.unified.to/hris/employee/model.md)[image\_url](https://docs.unified.to/hris/employee/model.md)[language\_locale](https://docs.unified.to/hris/employee/model.md)[last\_name](https://docs.unified.to/hris/employee/model.md)[name](https://docs.unified.to/hris/employee/model.md)[telephones](https://docs.unified.to/hris/employee/model.md)[timezone](https://docs.unified.to/hris/employee/model.md)[title](https://docs.unified.to/hris/employee/model.md)

Writable fields:

[\-none-](https://docs.unified.to/hris/employee/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)