Buttonsource should be bn

@coenjacobs doesn’t have to be in read me

includes/gateways/paypal/class-wc-gateway-paypal.php

@@ -285,7 +285,7 @@ class WC_Gateway_Paypal extends WC_Payment_Gateway {
 				'cancel_return' => esc_url( $order->get_cancel_order_url() ),
 				'page_style'    => $this->page_style,
 				'paymentaction' => $this->paymentaction,
-				'BUTTONSOURCE'          => 'WooThemes_Cart',
+				'bn'            => 'WooThemes_Cart',
 				
 				// Order key + ID
 				'invoice'       => $this->invoice_prefix . ltrim( $order->get_order_number(), '#' ),