---
title: login
slug: campaign/docs/login
docTags: 
createdAt: 2026-07-02T19:01:45.941Z
---

## Validity of a session

The **sessionId** – and therefore the session – becomes invalid after 20 minutes. You must use the *login*  method to obtain a new **sessionId**.

**Type**: String

**Parameters**

| Name       | Type   | Value                                                             |
| ---------- | ------ | ----------------------------------------------------------------- |
| mandatorId | long   | ID of the client you want login to                                |
| username   | String | Name of the user – must have the INTERFACE\_WEBSERVICE permission |
| password   | String | Password of the user                                              |

**Return values**

A **sessionId** that is required by all web service methods

**Code structure**

```javascript
String login(long mandatorId, String username, String password)
```