curl --request PUT \
  --url https://api.spotflow.co/api/v1/subscriptions/{subscription-id}/payment-method \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "encryptedCard": "string"
}
'

{
  "type": "card",
  "firstSix": "506124",
  "lastFour": "5456",
  "cardType": "verve",
  "accountHolderName": "Jane Doe",
  "expirationMonth": 11,
  "expirationYear": 2026
}