query WorkspaceSlackInstallationInfo($redirectUrl: String!) {
  workspaceSlackInstallationInfo(redirectUrl: $redirectUrl) {
    installationUrl
  }
}

{
  "redirectUrl": "string"
}

{
  "data": {
    "workspaceSlackInstallationInfo": {
      "installationUrl": "string"
    }
  }
}