Fetch vendor profile

curl --request GET \
  --url https://api.rampartcorporation.com/developer/v1/vendors/{slug} \
  --header 'Authorization: Bearer <token>'

{
  "slug": "staples-advantage",
  "url": "https://partner.rampartcorporation.com/vendor/staples-advantage",
  "averageSavings": 13.5
}