Didn't use PayPal till this purchase the other day. My debit card this time was safe but evidently my name etc right after this recent purchase from SDE activated someone trying to use the old card.My gut says you have a breach of those cards elsewhere, paypal doesn't exchange credit card info as previously explained. It would be literally impossible for an intermediary with SDE or Shopify access to view the paypal credit card data. That's why no paypal users are being affected, you would also be literally the only one which again points to another source for your woes.