## Update Tracker

`print_mail.trackers.update(strid, TrackerUpdateParams**kwargs)  -> TrackerUpdateResponse`

**post** `/print-mail/v1/trackers/{id}`

Update a Tracker by ID.

### Parameters

- `id: str`

- `redirect_url_template: str`

  The base template for URLs generated by this Tracker.

- `url_expire_after_days: Literal[30, 60, 90, 2 more]`

  The number of days generated Tracker URLs remain valid.

  - `30`

  - `60`

  - `90`

  - `180`

  - `365`

- `description: Optional[str]`

  An optional string describing this resource. Will be visible in the API and the dashboard.

- `metadata: Optional[Dict[str, object]]`

  See the section on Metadata.

### Returns

- `class TrackerUpdateResponse: …`

  - `id: str`

    A unique ID prefixed with tracker_

  - `created_at: datetime`

    The UTC time at which this resource was created.

  - `live: bool`

    `true` if this is a live mode resource else `false`.

  - `object: Literal["tracker"]`

    Always `tracker`.

    - `"tracker"`

  - `redirect_url_template: str`

    The base template for URLs generated by this Tracker.

  - `unique_visit_count: int`

    The unique number of interactions the Tracker has had.

  - `updated_at: datetime`

    The UTC time at which this resource was last updated.

  - `url_expire_after_days: Literal[30, 60, 90, 2 more]`

    The number of days generated Tracker URLs remain valid.

    - `30`

    - `60`

    - `90`

    - `180`

    - `365`

  - `visit_count: int`

    The total number of interactions the Tracker has had.

  - `description: Optional[str]`

    An optional string describing this resource. Will be visible in the API and the dashboard.

  - `metadata: Optional[Dict[str, object]]`

    See the section on Metadata.

### Example

```python
import os
from postgrid import PostGrid

client = PostGrid(
    print_mail_api_key=os.environ.get("POSTGRID_PRINT_MAIL_API_KEY"),  # This is the default and can be omitted
)
tracker = client.print_mail.trackers.update(
    id="id",
    redirect_url_template="https://postgrid.com?firstName={{to.firstName}}",
    url_expire_after_days=90,
)
print(tracker.id)
```

#### Response

```json
{
  "id": "tracker_123456789abcdefghijklmnopqrstuvwxyz",
  "object": "tracker",
  "live": false,
  "redirectURLTemplate": "https://postgrid.com?firstName={{to.firstName}}",
  "urlExpireAfterDays": 90,
  "visitCount": 0,
  "uniqueVisitCount": 0,
  "createdAt": "2020-11-12T23:30:12.581Z",
  "updatedAt": "2020-11-12T23:31:12.581Z"
}
```