paypal PI3 messaging/ banners with running totals

Site URL: http://fishmanaquatics.co.uk

I am aware that the Paypal PI3 option will not appear until paypal is selected and logged into at checkout. What I am currently trying (and failing to do) is to add the messaging on the Header and/or Footer of the page. I have got the small message at the top which says "pay in 3 payments on eligible purchases with Paypal Learn more" (learn more link does not work though), however I can not get it to show a running total of the cart vale so far, if it is possible anyway. Or add the pay in 3 calculation added to where the "add to cart" is? Just something that gives some form of running total if that makes sense.