Adding a card keeps a plan you had on Pix

Fixed

To move from Pix to a card, many people cancelled Pix first and added the card afterwards. The card was saved, but the cancellation still stood, and the plan ended on its renewal date without ever charging the card.

Now, adding a card to a Pix plan that was about to end undoes the cancellation. The plan carries on and the next renewal goes on the card.

You don't need to cancel to switch at all: just add the card under Update card details on the subscription page.