In short, Payburner is an XRP wallet currently implemented as a Chrome and Brave browser extension, allowing anyone to store and transact in XRP.
In a broader sense, Payburner is an ecosystem or network of user-facing components and backend services with the ambition of enabling the crypto economy of the future, today. Our Pay Buttons, already available on WooCommerce allow anyone to accept XRP payments for goods and services.
We have a lot of exciting plans for the future and we will unveil them as the system matures.