curl --request GET \
  --url https://rest.compute.cudo.org/v1/billing-accounts/{id}/payment-methods \
  --header 'Authorization: <api-key>'

{
  "paymentMethods": [
    {
      "card": {
        "brand": "<string>",
        "country": "<string>",
        "expMonth": "<string>",
        "expYear": "<string>",
        "fingerprint": "<string>",
        "last4": "<string>"
      },
      "id": "<string>",
      "isDefault": true,
      "paypal": {
        "payerEmail": "<string>",
        "payerId": "<string>"
      },
      "type": "<string>"
    }
  ]
}