Need to settle up with you

I purchased your plugin (woo product multi layout for woocommerce 3+ – unlimited site license) yesterday after clicking the checkout button I hit the back button to check something and your website gave me the plugin with out verifying that I had paid for it, I wasn’t sure what to do.  So I need to settle up with you, I owe you $15.  Can I send you some money through Paypal?