You can find your invoice on the website where you have ordered your spare part(s).
For the Brand Princess this is https://www.princesshome.eu/en-gb
For the Brand Tristar this is https://www.tristar.eu/en-gb/
Please log in with your username and password.
After you have logged in go to 'My account':
Click on 'My orders':
Open the arrow symbol in the field 'Order', choose 'Posted invoice detail' and click on the button 'Search':
Here you will find all your orders :
If you want to see details of the invoice press 'View details'.