curl --request PUT \
  --url https://api.{tenant}.getomneo.com/api/v3/currencies/{currency} \
  --header 'Content-Type: application/json' \
  --data '{
  "rate": 123
}'

{
  "data": {
    "id": 123,
    "from": "<string>",
    "to": "<string>",
    "rate": 123,
    "is_system": true,
    "created_at": "<string>",
    "updated_at": "<string>"
  }
}