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

# Users and contacts

> Look up users, avatars, and manage instance contacts

Use `users` and `contacts` to look up WhatsApp profiles and manage instance contacts.

For instances, see [Instances and billing](/en/sdk/dotnet/instances-and-billing).

## Contacts

### `client.Contacts.ListAsync<TResponse>(instanceId, options?)`

```csharp theme={null}
await client.Contacts.ListAsync<object>("VZ...", new InstanceRequestOptions { InstanceToken = "instance-token" });
```

**Return:** envelope `{ Code, Success, Data }` with contact array (`Jid`, `Name`, `IsInWhatsapp`, etc.).

### `client.Contacts.AddAsync<TResponse>(request)`

```csharp theme={null}
await client.Contacts.AddAsync<object>(new ContactAddRequest
{
    InstanceId = "VZ...",
    InstanceToken = "instance-token",
    Phone = "5511999999999",
    FirstName = "Maria",
    FullName = "Maria Silva",
});
```

**Return:** envelope `{ Code, Success, Data }` with confirmation text (e.g. `"Contact added"`).

## Users

### `client.Users.InfoAsync<TResponse>(request)`

```csharp theme={null}
await client.Users.InfoAsync<object>(new UserPhonesRequest { InstanceId = "VZ...", InstanceToken = "instance-token", Phone = "5511999999999" });
```

**Return:** envelope `{ Code, Success, Data }` with user profile fields (`VerifiedName`, `Status`, `PictureId`, etc.).

### `client.Users.CheckAsync<TResponse>(request)`

```csharp theme={null}
await client.Users.CheckAsync<object>(new UserPhonesRequest { InstanceId = "VZ...", InstanceToken = "instance-token", Phone = "5511999999999" });
```

**Return:** envelope `{ Code, Success, Data.Users[] }` with `Phone`, `Exists`, `Jid` per checked number.

### `client.Users.AvatarAsync<TResponse>(request)`

```csharp theme={null}
await client.Users.AvatarAsync<object>(new UserAvatarRequest { InstanceId = "VZ...", InstanceToken = "instance-token", Phone = "5511999999999" });
```

**Return:** envelope `{ Code, Success, Data }` with avatar `base64` and `mimetype`.

### `client.Users.ContactsAsync<TResponse>(instanceId, options?)`

```csharp theme={null}
await client.Users.ContactsAsync<object>("VZ...", new InstanceRequestOptions { InstanceToken = "instance-token" });
```

**Return:** envelope `{ Code, Success, Data }` — JID map to contact fields (`FirstName`, `FullName`, `PushName`, etc.).