# URL Parameters

Append these to any page URL to control Shoplift's behavior without modifying code.

| Parameter                   | Effect                                                                                              |
| --------------------------- | --------------------------------------------------------------------------------------------------- |
| `?slVariant=<hypothesisId>` | Forces `isHypothesisActive()` to return `true` for the specified hypothesis, `false` for all others |
| `?slVariant=true`           | Forces `isHypothesisActive()` to return `true` for **all** hypotheses                               |
| `?isShopliftMerchant=true`  | Switches Shoplift into merchant preview mode (stub API, no test assignment or tracking)             |
| `?isShopliftMerchant=false` | Exits merchant preview mode                                                                         |

{% hint style="warning" %}
`isShopliftMerchant` persists in **sessionStorage** — once set, it affects all subsequent pages in the same browser tab until the session ends or you explicitly set `?isShopliftMerchant=false`.
{% endhint %}

#### Examples

Force a specific variant:

```
https://yourstore.com/products/example?slVariant=aa800953-3e22-4335-a53b-50f61db17538
```

Force all variants active (useful for visual QA):

```
https://yourstore.com/?slVariant=true
```

Enter merchant preview mode:

```
https://yourstore.com/?isShopliftMerchant=true
```

Exit merchant preview mode:

```
https://yourstore.com/?isShopliftMerchant=false
```