Get a conversion

curl --request GET \
  --url https://api.exchange.coinbase.com/conversions/{conversion_id} \
  --header 'cb-access-key: <api-key>' \
  --header 'cb-access-passphrase: <api-key>' \
  --header 'cb-access-sign: <api-key>' \
  --header 'cb-access-timestamp: <api-key>'

{
  "id": "c5aaf125-d99e-41fe-82ea-ad068038b278",
  "amount": "11.00000000",
  "from_account_id": "5dcc143c-fb96-4f72-aebf-a165e3d29b53",
  "to_account_id": "6100247f-90fc-4335-ac17-d99839f0c909",
  "from": "USDC",
  "to": "USD",
  "fee_amount": "0.0000000000000000"
}