Thanks for considering donating to LunaSea! Donations are what keep the project alive and completely free for everyone to use. There are a few options available:
If you have downloaded LunaSea through the Play Store or App Store, you can directly donate using in-app purchases! Simply head to the Settings and tap the "Donations" tile. There are four options available (all scaled to USD): $0.99, $2.99, $4.99, and $9.99.
I have setup a Ko-Fi account for LunaSea, available here: https://ko-fi.com/jagandeepbrar.
Ko-Fi allows you to make a one-time donation in $1 increments using PayPal.
I also have setup a GitHub Sponsors account, which is available here: https://github.com/sponsors/JagandeepBrar.
GitHub Sponsors allow you to setup a recurring donation in the amount of $1 to $5.