How do I change an existing subscription's payment method?

[Serubyne]

I bought the expansions subscription for EU4 some time ago using my card, but now I want to change its payment method to a virtual wallet (not Steam Wallet) for convenience before I go buy it again.

The manage subscriptions menu doesn't tell me where or how to change payment method, and going to the store page and adding the subscription to cart just redirects me to the manage subscriptions menu.

Are subscriptions permanently tied to a single payment method or is it possible to change it?

[DarkCrystalMethod]

Try cancelling the subscription and if that works sign up with the new card. I don't imagine they had the foresight to design a card mirgation process.

If that don't work empty the account of its money. That'll stop all the payments for sure.

Of course you could make a Steam Support ticket, get annoyed at the autoresponder answering something completely different, asking again and then they can maybe handle it but only have it effective by the date of the support ticket. Don't provide card info until they ask.

[Jasung]

Check this article. You should be able to change your payment methods under account details.
https://help.steampowered.com/en/faqs/view/726E-E811-168F-0D9E
When adding a subscription to the cart, you should be able to select a different payment type by going back one step during the checkout process if you have a default payment method already set up. (It's something I do fairly often with normal purchases, in fact.)