curl --request PUT \
  --url https://api.headlesscommerce.io/v1/admin/currency-rates \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "from_currency": "<string>",
  "to_currency": "<string>",
  "rate": 123
}
'

{
  "id": "<string>",
  "from_currency": "<string>",
  "to_currency": "<string>",
  "rate": 123,
  "updated_at": "2023-11-07T05:31:56Z"
}