Delete an audience attribute value

curl --request POST \
  --url https://your_a2_service/audiences/attributes-values/delete \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "code": "<string>",
  "value": "<string>",
  "hard_delete": false
}
'

{
  "detail": "<string>"
}