For headless flows: lists the GA4 properties of a pending Google Analytics connect, so you can show your own picker.

Flow

1. The connect started with redirect_url=...?headless=true, and the Google account can read several GA4 properties.
2. Zernio redirects to your redirect_url with step=select_property, profileId, platform=googleanalytics and a pendingDataToken.
3. Call this to list the properties and show your own picker.
4. Call POST /v1/connect/googleanalytics/select-property.

Token

• Listing does not consume the token.
• A headless token passes through your own URLs, so it is honored only together with your API key (or connect token) for the same profile.
• It expires after one hour.

{
  "properties": [
    {
      "propertyId": "312456789",
      "displayName": "acme.com",
      "accountName": "Acme Inc"
    }
  ]
}