Is this possible?
Yup! I believe you can leave a balance in your PayPal account without the need of a credit card. You just need it attached to your bank account.
used to work for me but now (after freezing my account for a month) requires a credit card…
same problem - the 7-day-trial is over and i can’t log on to paypal without a credit card …
my problem is solved - i confirmed my bank account @paypal and zwift connected through to the PayPal-Portal without asking for credit card Infos.
This is generally an issue with PAYPAL. Sometimes they require authorization (or, at least, contacting them) to allow for recurring payments via a balance versus a connected bank account/credit card.
If it’s not allowing you to sign up for Zwift despite having funds in your PayPal account, contact them and they should be able to sort it out for you.