If you go to the tab on the top that states Store...on the left hand side of the page there is an upload logo url.
Also that is where you set up all of the tabs in your store...contact me, about us, contact etc.
If you accept Paypal once you setup the means of payment it will automatically place the logo into your store.
I can't remember whether or not eBay lifted the ban on Bidpay or not. If they didn't then you might not be able to have the logo showing.
You can always add a blog about Bidpay and that would draw your customers attention to the fact you accept this means of payment.
I think once you see the tabs with everything you can use to personalize the Auctiva Store..then you'll be pleased.
I own several domains and I have one setup just to forward to the Auctiva Store..here's my example under this eBay ID. (I own several eBay IDs)
http://www.Southernjewel.comBest of luck,
Donna
