diff -ur ubercart-6.x-2.4/payment/uc_paypal/uc_paypal.module ubercart/payment/uc_paypal/uc_paypal.module
--- ubercart-6.x-2.4/payment/uc_paypal/uc_paypal.module	2010-08-11 12:52:20.000000000 -0500
+++ ubercart/payment/uc_paypal/uc_paypal.module	2011-04-16 11:05:48.000000000 -0500
@@ -669,7 +669,7 @@
     'CANCELURL' => url('uc_paypal/wps/cancel', array('absolute' => TRUE)),
     'AMT' => uc_price($order->order_total, $context, $options),
     'CURRENCYCODE' => variable_get('uc_paypal_wpp_currency', 'USD'),
-    'PAYMENTACTION' => variable_get('uc_paypal_wpp_payment_action', 'Sale'),
+    'PAYMENTACTION' => variable_get('uc_pg_paypal_wpp_cc_txn_type', 'auth_capture') == 'authorize' ? 'Authorization' : 'Sale',
     'DESC' => substr($desc, 0, 127),
     'INVNUM' => $order->order_id .'-'. time(),
     'REQCONFIRMSHIPPING' => variable_get('uc_paypal_ec_rqconfirmed_addr', 0),
@@ -758,7 +758,7 @@
     'CANCELURL' => url('uc_paypal/wps/cancel', array('absolute' => TRUE)),
     'AMT' => uc_price($subtotal, $context, $options),
     'CURRENCYCODE' => variable_get('uc_paypal_wpp_currency', 'USD'),
-    'PAYMENTACTION' => variable_get('uc_paypal_wpp_payment_action', 'Sale'),
+    'PAYMENTACTION' => variable_get('uc_pg_paypal_wpp_cc_txn_type', 'auth_capture') == 'authorize' ? 'Authorization' : 'Sale',
     'DESC' => substr($desc, 0, 127),
     'INVNUM' => $order->order_id .'-'. time(),
     'REQCONFIRMSHIPPING' => variable_get('uc_paypal_ec_rqconfirmed_addr', 0),
@@ -826,7 +826,7 @@
   $nvp_request = array(
     'METHOD' => 'DoExpressCheckoutPayment',
     'TOKEN' => $_SESSION['TOKEN'],
-    'PAYMENTACTION' => variable_get('uc_paypal_wpp_payment_action', 'Sale'),
+    'PAYMENTACTION' => variable_get('uc_pg_paypal_wpp_cc_txn_type', 'auth_capture') == 'authorize' ? 'Authorization' : 'Sale',
     'PAYERID' => $_SESSION['PAYERID'],
     'AMT' => uc_price($order->order_total, $context, $options),
     'DESC' => substr($desc, 0, 127),