curl --request GET \
  --url http://localhost:3000/api/canary/payment-methods/{id} \
  --header 'Authorization: Bearer <token>'

{
  "id": "pm_001",
  "customerId": "customer_789",
  "type": "card",
  "brand": "visa",
  "last4": "4242",
  "expiryMonth": 12,
  "expiryYear": 2025,
  "isDefault": true,
  "createdAt": "2025-01-15T10:30:00.000Z"
}