Over 70% of orders not going through – Help!

You’d need to check your merchant accounts for reasons; I know for example Stripe logs failed transactions. See why over there.

Hi Punk100UK, I can took a look at your website/setting if you want.
Just send me an email at pieterclaesen AT gmail DOT com.

@pieterclaesen, try to keep all forum support in the open. Offering your email address like that may be you being nice, but it is against the forum rules: https://codex.www.ads-software.com/Forum_Welcome#The_Bad_Stuff

@punk100uk, check with the payment processes first and see if you can get any info like Mike suggested.

Regarding paypal orders going to pending, this could be an IPN issue: https://docs.woocommerce.com/document/paypal-standard/#section-9