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

# Contact

### Definition

A contact is a customer or supplier record in the invoicing software. It holds a name, address, email, and optionally a VAT number or tax identifier.

<Note>
  In this context, "customer" refers to a buyer or supplier in the consumer's invoicing software, not the Chift [Consumer](/developer-guides/glossary#consumer) (the integrator's customer).
</Note>

### Purpose

Contacts identify who an invoice is issued to or received from. The invoicing software uses the contact to populate the invoice header.

### Relationships

* Referenced by invoices and opportunities.

### Endpoints

#### Read

| Method | Endpoint                                                                          | Description                    |
| ------ | --------------------------------------------------------------------------------- | ------------------------------ |
| GET    | [Retrieve all contacts](/api-reference/endpoints/invoicing/retrieve-all-contacts) | Returns a list of all contacts |
| GET    | [Retrieve one contact](/api-reference/endpoints/invoicing/retrieve-one-contact)   | Returns a single contact by ID |

#### Write

| Method | Endpoint                                                                | Description           |
| ------ | ----------------------------------------------------------------------- | --------------------- |
| POST   | [Create a contact](/api-reference/endpoints/invoicing/create-a-contact) | Creates a new contact |

### See also

* [Invoices](/unified-apis/invoicing/concepts/invoice)
* [Opportunities](/unified-apis/invoicing/concepts/opportunity)