As a property seeker on BostadsPortal, you can always find all your receipts for your subscription by clicking on 'Subscription' in the menu at BostadPortal.se.
Make sure you are logged into your account first and click on your profile picture in the top right corner.
Here you will find an overview of all your payments and can press 'Show receipt' to the right of the payment you want to see the receipt of.
The receipt will open in a new window and from there you can save it to PDF or print it.