**Steps to replicate the issue** (include links if applicable):
* Settings > Donate
* Donate with Google Pay
* Choose first amount ($3), then choose last suggested amount ($100)
**What happens?**:
* Transaction fee remains the same at $0.35
**What should have happened instead?**:
* Transaction fee should scale up with amount, matching behavior of [[ https://donate.wikimedia.org/w/index.php?title=Special:LandingPage&country=US&uselang=en&utm_medium=spontaneous&utm_source=fr-redir&utm_campaign=spontaneous | donate.wikimedia.org ]]
(https://drive.google.com/file/d/1hAqiOGtYRxDoQ8Y2E5GGSg2MYVIxn4Uf/view?usp=sharing)
**Reference**
- The fee should be 4% of the amount, or the relevant fee minimum, whichever is higher. The default fee minimum is 0.35
- Function: https://meta.wikimedia.org/wiki/MediaWiki:FundraisingBanners/CoreJS-2018.js#L-461