The Variable Price add-on for the Checkout for PayPal plugin lets customers enter their own payment amount. This is ideal for donations, pay-what-you-want products, or flexible service pricing.
PayPal
Checkout for PayPal WordPress Plugin
Checkout for PayPal WordPress plugin connects PayPal to your WordPress website and makes e-commerce available for you. With this PayPal plugin, you can create smart payment buttons with a simple shortcode to accept PayPal payments from your customers.