curl --request GET \
  --url https://api.speedsellx.io/seller/v1/upsells/{id}

{
  "data": {
    "id": 123,
    "product_id": 123,
    "funnel_id": 123,
    "name": "<string>",
    "status": "<string>",
    "accept_text": "<string>",
    "refuse_text": "<string>",
    "accept_page": "<string>",
    "refuse_page": "<string>",
    "accept_redirect": "<string>",
    "refuse_redirect": "<string>",
    "created_at": "<string>",
    "updated_at": "<string>"
  }
}