curl --request POST \
  --url https://api.speedsellx.io/seller/v1/upsells \
  --header 'Content-Type: application/json' \
  --data '
{
  "product_id": 2,
  "name": "<string>",
  "status": "<string>",
  "accept_text": "<string>",
  "refuse_text": "<string>",
  "accept_page": "<string>",
  "refuse_page": "<string>",
  "accept_redirect": "<string>",
  "refuse_redirect": "<string>"
}
'

{
  "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>"
  }
}