Method: Returns notify URL for gateway.
Filter Hook: Allow plugins to filter the list of supported currencies.
Method: Process the IPN.
Method: Returns whether or not all of the required fields have been entered
Method: Check if the cart currently being checked out contains any tickets.
Method: Process the payment and return the result.
Method: Check for PayPal IPN Response
Filter Hook: Filters the current debug setting for WooCommerce. Defaults debugging to false.