I've managed to customise the payment page using Paypal. Go to My Account, Profile, then (under selling preferences) Custom Payment Pages. This enables you to add your own logo etc.

However, I have a question regarding the Image URL. Paypal suggests using an image only if it is stored on a secure server. I read that I can purchase SSL through Blue Voda but is Paypay not already using a secure server? I don't really want to purchase a certificate just to upload an image onto their page.

Any suggestions please?