> ## Documentation Index
> Fetch the complete documentation index at: https://docs.maesn.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Abacus

> Integrate Abacus and Ababau easily with Maesn’s Unified API. See the documentation with detailed system coverage and setup prerequisites.

**TARGET\_SYSTEM:** `abacus` `abacus-sandbox-24`

## API Differences

This target system connects via the **Abacus [REST API](https://apihub.abacus.ch/rest)**.
Some functionality may not be available in the REST API but can exist in the **[AbaConnect Webservices](https://downloads.abacus.ch/downloads/abaconnect)**.
In those cases, the **AbaConnect** target system may support the required endpoints.
If you are unsure which target system is appropriate for your use case, please contact us.

## Authentication

* **abacus** uses **OAuth**
* **AbaConnect** uses **username + password**

Because of these differences, we recommend selecting **one target system** and using it consistently.\
Most core resources (such as contacts and projects) are available in both systems, though implementation details differ.

<div className="integration-table">
  |                      |                          Read                          |                         Create                         |                         Update                         |                         Delete                         |                         Webhook                        |
  | -------------------- | :----------------------------------------------------: | :----------------------------------------------------: | :----------------------------------------------------: | :----------------------------------------------------: | :----------------------------------------------------: |
  | Accounts             | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> |
  | Async task           | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> |
  | Bank accounts        | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> |
  | Bills                | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> |
  | Bill lines           | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> |
  | Booking proposals    | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> |
  | Contacts             | <Icon icon="check" iconType="solid" color="#4db975" /> | <Icon icon="check" iconType="solid" color="#4db975" /> | <Icon icon="check" iconType="solid" color="#4db975" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> |
  | Customers            | <Icon icon="check" iconType="solid" color="#4db975" /> | <Icon icon="check" iconType="solid" color="#4db975" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> |
  | Credit notes         | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> |
  | Dimensions           | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> |
  | Expenses             | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> |
  | Files                | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> |
  | Fiscal years         | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> |
  | Goods receipts       | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> |
  | Goods receipt lines  | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> |
  | Invoices             | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> |
  | Invoice lines        | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> |
  | Items                | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> |
  | Journals             | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> |
  | Journal entries      | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> |
  | Offers               | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> |
  | Offer lines          | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> |
  | Open items           | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> |
  | Payments             | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> |
  | Payment terms        | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> |
  | Projects             | <Icon icon="check" iconType="solid" color="#4db975" /> | <Icon icon="check" iconType="solid" color="#4db975" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> |
  | Purchase orders      | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> |
  | Purchase order lines | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> |
  | Sales orders         | <Icon icon="check" iconType="solid" color="#4db975" /> | <Icon icon="check" iconType="solid" color="#4db975" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> |
  | Sales order lines    | <Icon icon="check" iconType="solid" color="#4db975" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> |
  | Suppliers            | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> |
  | Tax rates            | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> |
  | Transactions         | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> |
  | Trial balance        | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> |
  | Units                | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> |
  | Users                | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> | <Icon icon="phone" iconType="light" color="#828282" /> |
  | Vendor credits       | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> | <Icon icon="xmark" iconType="solid" color="#828282" /> |
</div>

<Icon icon="check" iconType="solid" color="#4db975" /> = Supported by Maesn <br />
<Icon icon="phone" iconType="light" color="#828282" /> = On demand - contact us<br />
<Icon icon="xmark" iconType="solid" color="#828282" /> = Not supported by Abacus <br />

## How to connect to Abacus

To allow your customers to link your application with their Abacus account, you need to set up a **user-dependent service user** in Abacus.

<Note>
  The Base URL for Abacus depends on the server configuration and can vary based on whether Abacus is installed locally by the user or hosted via a subscription.
  To authenticate, you must provide the correct Base URL by including it as the `baseUrl` query parameter in the `GET /auth/TARGET_SYSTEM` request.
  For the Abacus sandbox v2024, this is pre-configured.
</Note>

<Note>
  When targeting Abacus endpoints, it is essential to include the *environmentName* query parameter.\
  You can obtain this value by using the `GET Environments` endpoint available under the **Authentication** section.
</Note>

<Steps>
  <Step title="Prerequisites">
    Before you begin, make sure you have the following:

    * An abacus instance with administrator permissions.
    * For **production environments**, the user must have permissions to access the **mandant-provisioning API**.

    If you don't have an Abacus instance, you can contact their team at **[rest-api@abacus.ch](mailto:rest-api@abacus.ch)** to request a sandbox instance.
  </Step>

  <Step title="Set Up a Service User in Abacus">
    Follow the instructions in the video under the **Authorization Code Grant** section of the [Abacus Authentication Guide](https://apihub.abacus.ch/authentication).\
    Set the **login redirect URL** to: `https://api.maesn.dev/auth/callback/{abacus-version}`
    Replace `{abacus-version}` with the appropriate version of Abacus you are integrating with.

    If you are using the **Abacus sandbox**, you must contact **[rest-api@abacus.ch](mailto:rest-api@abacus.ch)** to set up your user-dependent service user.
  </Step>

  <Step title="Configure Your Integration in the Maesn API">
    Finally, set up your API tenant with your application's details. Contact your maesn representative to provide the following information:

    * **Application (Client) ID** of your application
    * For sandbox environments, also include the **mandant ID**.

    If you are not sure who your technical contact is, do not hesitate to [reach out to us](https://www.maesn.com/contact).
  </Step>
</Steps>