# register()

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]

```swift
public func register(
  placement: String,
  params: [String: Any]? = nil,
  handler: PaywallPresentationHandler? = nil,
  feature: @escaping () -> Void
)
```

```swift
public func register(
  placement: String,
  params: [String: Any]? = nil,
  handler: PaywallPresentationHandler? = nil
)
```

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;[String: Any]?&#x22;,
    description: &#x22;Optional parameters to pass with your placement. These can be referenced within audience filters in your campaign. Keys beginning with `$` are reserved for Superwall and will be dropped. Arrays and dictionaries are currently unsupported and will be ignored.&#x22;,
    default: &#x22;nil&#x22;,
  },
  handler: {
    type: &#x22;PaywallPresentationHandler?&#x22;,
    description: &#x22;A handler whose functions provide status updates for the paywall lifecycle.&#x22;,
    default: &#x22;nil&#x22;,
  },
  feature: {
    type: &#x22;(() -> Void)?&#x22;,
    description: &#x22;An optional completion block 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 `Void`. If you supply a `feature` block, it will be executed according to the paywall's gating configuration, as described above.

Usage [#usage]

```swift
Superwall.shared.register(
  placement: "premium_feature",
  params: ["source": "onboarding"]
) {
  // Code that unlocks the premium feature
  openPremiumScreen()
}
```

```swift
Superwall.shared.register(
  placement: "onboarding_complete",
  params: ["source": "onboarding"],
  handler: self
)
```