Not sure my search engine skills are any better but here are a few links:

From 2 years ago: https://www.reddit.com/r/GrapheneOS/comments/126nd51/comment... -> Sounds like Curve (without Google Pay) wasn't officially supported in Europe and didn't work for most people.

However, this seems to have changed a couple days ago:

https://www.reddit.com/r/curve/comments/17txz6u/comment/mkwl...

https://discuss.grapheneos.org/d/443-gpay-alternatives-for-g...

https://discuss.grapheneos.org/d/475-wallet-google-pay/105

https://discuss.privacyguides.net/t/curve-pay-available-as-a...

This is in line with an interview with the CEO of Curve from last month, https://paymentsconsulting.com/qa-with-shachar-bialick-at-cu...

> We are launching Curve Pay in beta for Android soon and plan to release it on iOS thereafter. This will allow customers to use Curve as their default wallet, just like Apple Pay or Google Pay.

…and with various German news sites reporting that Curve Pay is now available in Germany (and likely other parts of the EEA).