curl --request GET \
  --url https://api.useduro.com/portal/email/cards \
  --header 'x-portal-session: <api-key>'

{
  "items": [
    {
      "id": "<string>",
      "brand": "<string>",
      "last4": "<string>",
      "expMonth": 123,
      "expYear": 123,
      "isDefault": true
    }
  ]
}