curl --request POST \
  --url https://app.variable.global/api/auth/token \
  --header 'Authorization: Basic <encoded-value>' \
  --header 'Content-Type: application/x-www-form-urlencoded' \
  --data grant_type=client_credentials

{
  "access_token": "<string>",
  "refresh_token": "<string>",
  "token_type": "<string>",
  "scope": "<string>"
}