curl --request GET \
  --url https://api.quiva.ai/accounts/payment/subscription-items \
  --header 'Authorization: Bearer <token>'

{
  "data": {
    "has_default_payment_method": true,
    "items": [
      {
        "id": "<string>",
        "quantity": 123,
        "price": {
          "id": "<string>",
          "currency": "<string>",
          "unit_amount": 123,
          "amount": 123,
          "lookup_key": "<string>",
          "nickname": "<string>",
          "metadata": {}
        }
      }
    ]
  }
}