curl --request POST \
  --url https://api.hubapi.com/cms/v3/pages/site-pages/ab-test/end \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "abTestId": "<string>",
  "winnerId": "<string>"
}
'

This response has no body data.