Fix Error With Paypal / Woocommerce Payments

We've added Paypal to our wordpress ecommerce site, which is also using Woocommerce Payments, however we can't get Paypal to work, when ever we click on it it just gives the error - Something went wrong. Please try again or choose another payment source.

We need someone with knowledge and experience of working with Paypal and Woocommerce to find out what is going wrong and fix it for us.

Thanks

Peter