95. Don't just accept payment through PayPal. Many people have had bad experiences with PayPal and prefer to use alternative, simpler payment methods.
95a. List the payment methods you accept somewhere noticeable.
If you have a high rate of shopping cart abandonment, perhaps it is because the customer had to add something to their cart and go partway through the checkout process to find out what payment methods you accept. And then abandoned your site when they discovered it was not a payment method they wanted to use.