curl --request POST \
  --url https://a.contactlevel.com/api/audiences/contacts/remove \
  --header 'Content-Type: application/json' \
  --header 'X-Api-Key: <api-key>' \
  --data '
{
  "organization_id": "<string>",
  "audience_id": "<string>",
  "contact_id": "<string>"
}
'

{
  "organization_id": "<string>",
  "audience_id": "<string>",
  "removed": true
}