The **Settings** page has three sections: **Company**, **Invoicing** and **API Key**. Zimple shows the company and
invoicing details on the invoices that it sends to you.

Click **Save changes** to save a change of a field in **Company** or **Invoicing**. See
[Update your company details](/docs/partner-portal/settings/update-your-company-details).

## Company

| Field            | Contents                                                        | Rules                                         |
| ---------------- | --------------------------------------------------------------- | --------------------------------------------- |
| **Company name** | The name of your Partner on invoices and in the Partner Portal. | Cannot be empty. A maximum of 256 characters. |

## Invoicing

| Field                  | Contents                                                                   | Rules                                 |
| ---------------------- | -------------------------------------------------------------------------- | ------------------------------------- |
| **E-invoice address**  | The OVT or EDI address that your invoicing operator uses.                  | A maximum of 64 characters, or empty. |
| **E-invoice operator** | The operator that sends the e-invoice to you.                              | A maximum of 64 characters, or empty. |
| **Invoicing email**    | The email address that gets the invoice when an e-invoice is not possible. | An email address, or empty.           |
| **Business ID**        | The Finnish business ID (Y-tunnus), the EU VAT number or a national ID.    | A maximum of 32 characters, or empty. |

Leave **E-invoice address** empty if you do not use e-invoices. In the window **Confirm changes**, **Business ID**
shows as **Business ID (Y-tunnus / VAT)**.

## API Key

| Item                 | Contents                                                                              |
| -------------------- | ------------------------------------------------------------------------------------- |
| Key status           | **API key is set** and the last 4 characters of the key, or **No API key set.**       |
| **Generate API key** | Generates the Partner API key. When a key is set, the button is **Generate new key**. |
| **Revoke**           | Revokes the Partner API key. It shows only when a key is set.                         |
| **Base URL**         | The address of the Partner API, with a copy icon.                                     |
| **Documentation**    | The link to the Swagger UI of the Partner API, with a copy icon.                      |

See [Manage the Partner API key](/docs/partner-portal/settings/manage-the-partner-api-key) and
[Partner API](/docs/partner-portal/reference/partner-api).