# registerPlacement()

A function that registers a placement that can be remotely configured to show a paywall and gate feature access.

Purpose [#purpose]

Registers a placement so that when it's added to a campaign on the Superwall Dashboard, it can trigger a paywall and optionally gate access to a feature.

Signature [#signature]

```dart
Future<void> registerPlacement(
  String placement, {
  Map<String, Object>? params,
  PaywallPresentationHandler? handler,
  Function()? feature,
})
```

```dart
Future<void> registerPlacement(
  String placement, {
  Map<String, Object>? params,
  PaywallPresentationHandler? handler,
})
```

Parameters [#parameters]

<TypeTable
  type="{
  placement: {
    type: &#x22;String&#x22;,
    description: &#x22;The name of the placement you wish to register.&#x22;,
    required: true,
  },
  params: {
    type: &#x22;Map<String, Object>?&#x22;,
    description: &#x22;Optional parameters to pass with your placement. These can be referenced within campaign rules. Keys beginning with `$` are reserved for Superwall and will be dropped. Nested maps and lists are currently unsupported and will be ignored.&#x22;,
    default: &#x22;null&#x22;,
  },
  handler: {
    type: &#x22;PaywallPresentationHandler?&#x22;,
    description: &#x22;A handler whose functions provide status updates for the paywall lifecycle.&#x22;,
    default: &#x22;null&#x22;,
  },
  feature: {
    type: &#x22;Function()?&#x22;,
    description: &#x22;A callback representing the gated feature. It is executed based on the paywall's gating mode: called immediately for **Non-Gated**, called after the user subscribes or if already subscribed for **Gated**.&#x22;,
  },
}"
/>

Returns / State [#returns--state]

This function returns a `Future<void>`. If you supply a `feature` callback, it will be executed according to the paywall's gating configuration, as described above.

Usage [#usage]

```dart
await Superwall.shared.registerPlacement(
  "premium_feature",
  params: {"source": "onboarding"},
  feature: () {
    // Code that unlocks the premium feature
    openPremiumScreen();
  },
);
```

```dart
await Superwall.shared.registerPlacement(
  "onboarding_complete",
  params: {"source": "onboarding"},
  handler: myHandler,
);
```