Can Craft Commerce receive back the address used in paypal express checkout?
Well, after a transaction, you can log the full gateway response etc using this event: https://craftcommerce.com/docs/events-reference#commerce_transactions.onsavetransaction

(See what you can get at/log at https://craftcommerce.com/docs/transaction-model)

craft()-&gt;on('commerce_transactions.onSaveTransaction', function ($event){

      $transaction = $event-&gt;params['transaction'];
      BusinessLogicPlugin::log($transaction-&gt;response);

 });


...that should hopefully get you started on grabbing the data you need (I presume PayPal returns the address) - and then adding that to the cart at that point.