# invoices.groups.list

List shared billing groups by project. A group identifies the same underlying work across independent legal recipients. Collaborators are not billing recipients.

`GET | POST /api/v1/accounting/invoices.groups.list`

Permissions: `accounting:read` · Roles: admin, finance

MCP tool: `accounting_invoices_groups_list`

## Fields

| Field | Type | Required | Notes |
| --- | --- | --- | --- |
| `projectId` | string (ID) |  | The ID of the related record. |
| `limit` | integer |  | How many results to return at most. 1 to 100. Default `25`. |
| `offset` | integer |  | How many results to skip, for the next page of a list. 0 to 100000. Default `0`. |

## Example request

```bash
curl https://app.getoatmilk.com/api/v1/accounting/invoices.groups.list \
  -H "Authorization: Bearer $OATMILK_API_KEY"
```

Reference page: https://app.getoatmilk.com/docs/api/invoices.groups.list