curl --request PUT \
  --url https://api.example.com/v1/plus/manage/products/{id}/images/{image_id}/ \
  --header 'Content-Type: application/json' \
  --data '
{
  "thumbnail": "<string>",
  "order": -1
}
'

{
  "id": 123,
  "thumbnail": "<string>",
  "order": -1
}