GET
    /metadata/reference_rate_providers
  
  curl \
 --request GET 'https://api.arta.io/metadata/reference_rate_providers' \
 --header "Authorization: ARTA_APIKey s0e1t2e3c4a5s6t7r8o9n10o11m12y"
        Response examples (200)
  
  # Headers
content-type: application/json
x-arta-request-id: FkBjuxbwLLTx4RoAARkx
# Payload
[
  {
    "id": "arta",
    "name": "Arta"
  },
  {
    "id": "dhl_express",
    "name": "DHL Express"
  },
  {
    "id": "fedex",
    "name": "FedEx"
  },
  {
    "id": "ups",
    "name": "UPS"
  },
  {
    "id": "usps",
    "name": "USPS"
  }
]