How much should I donate
This depends on how much you like and use SCD, or if you'd just like to get rid of the message when you quit the app. There is no upper limit, but the minimum is 1CHF.
Here is a link to the donation page: Donation page.
After the donation, you'll receive an email to your PayPal email address. If this address isn't correct/outdated, then please let me know by entering some instructions on PayPal at checkout, or send me a mail to firstname.lastname@example.org with the Transaction ID of the donation or any other proof of the donation!