Access to ad group-level extensions.

For example, to access all sitelinks belonging to an ad group:

```
var adGroupSitelinkIterator = adGroup.extensions().sitelinks().get();
while (adGroupSitelinkIterator.hasNext()) {
  var adGroupSitelink = adGroupSitelinkIterator.next();
}
```

### Methods:

| Member | Type | Description |
|---|---|---|
| [callouts()](https://developers.google.com/google-ads/scripts/docs/reference/adsapp/adsapp_adgroupextensions#callouts) | `https://developers.google.com/google-ads/scripts/docs/reference/adsapp/adsapp_adgroupcalloutselector` | Returns the selector of all callouts in the ad group. |
| [mobileApps()](https://developers.google.com/google-ads/scripts/docs/reference/adsapp/adsapp_adgroupextensions#mobileApps) | `https://developers.google.com/google-ads/scripts/docs/reference/adsapp/adsapp_adgroupmobileappselector` | Returns the selector of all mobile apps in the ad group. |
| [phoneNumbers()](https://developers.google.com/google-ads/scripts/docs/reference/adsapp/adsapp_adgroupextensions#phoneNumbers) | `https://developers.google.com/google-ads/scripts/docs/reference/adsapp/adsapp_adgroupphonenumberselector` | Returns the selector of all phone numbers in the ad group. |
| [prices()](https://developers.google.com/google-ads/scripts/docs/reference/adsapp/adsapp_adgroupextensions#prices) | `https://developers.google.com/google-ads/scripts/docs/reference/adsapp/adsapp_adgrouppriceselector` | Returns the selector of all prices in the ad group. |
| [sitelinks()](https://developers.google.com/google-ads/scripts/docs/reference/adsapp/adsapp_adgroupextensions#sitelinks) | `https://developers.google.com/google-ads/scripts/docs/reference/adsapp/adsapp_adgroupsitelinkselector` | Returns the selector of all sitelinks in the ad group. |
| [snippets()](https://developers.google.com/google-ads/scripts/docs/reference/adsapp/adsapp_adgroupextensions#snippets) | `https://developers.google.com/google-ads/scripts/docs/reference/adsapp/adsapp_adgroupsnippetselector` | Returns the selector of all snippets in the ad group. |

## `callouts()`

Returns the selector of all callouts in the ad group.

### Return values:

| Type | Description |
|---|---|
| `https://developers.google.com/google-ads/scripts/docs/reference/adsapp/adsapp_adgroupcalloutselector` | The selector of all callouts in the ad group. |

## `mobileApps()`

Returns the selector of all mobile apps in the ad group.

### Return values:

| Type | Description |
|---|---|
| `https://developers.google.com/google-ads/scripts/docs/reference/adsapp/adsapp_adgroupmobileappselector` | The selector of all mobile apps in the ad group. |

## `phoneNumbers()`

Returns the selector of all phone numbers in the ad group.

### Return values:

| Type | Description |
|---|---|
| `https://developers.google.com/google-ads/scripts/docs/reference/adsapp/adsapp_adgroupphonenumberselector` | The selector of all phone numbers in the ad group. |

## `prices()`

Returns the selector of all prices in the ad group.

### Return values:

| Type | Description |
|---|---|
| `https://developers.google.com/google-ads/scripts/docs/reference/adsapp/adsapp_adgrouppriceselector` | The selector of all prices in the ad group. |

## `sitelinks()`

Returns the selector of all sitelinks in the ad group.

### Return values:

| Type | Description |
|---|---|
| `https://developers.google.com/google-ads/scripts/docs/reference/adsapp/adsapp_adgroupsitelinkselector` | The selector of all sitelinks in the ad group. |

## `snippets()`

Returns the selector of all snippets in the ad group.

### Return values:

| Type | Description |
|---|---|
| `https://developers.google.com/google-ads/scripts/docs/reference/adsapp/adsapp_adgroupsnippetselector` | The selector of all snippets in the ad group. |