exception 'Exception' with message 'PayPal response hasn't required fields.' in C:\Web\mystore\app\code\core\Mage\Paypal\Model\Api\Nvp.php:996
Stack trace:
C:\Web\mystore\app\code\core\Mage\Paypal\Model\Api\Nvp.php(644): Mage_Paypal_Model_Api_Nvp->call('DoExpressChecko...', Array)
C:\Web\mystore\app\code\core\Mage\Paypal\Model\Express.php(581): Mage_Paypal_Model_Api_Nvp->callDoExpressCheckoutPayment()
C:\Web\mystore\app\code\core\Mage\Paypal\Model\Express.php(377): Mage_Paypal_Model_Express->_placeOrder(Object(Mage_Sales_Model_Order_Payment), '987')
C:\Web\mystore\app\code\core\Mage\Sales\Model\Order\Payment.php(443): Mage_Paypal_Model_Express->capture(Object(Mage_Sales_Model_Order_Payment), '987')
C:\Web\mystore\app\code\core\Mage\Sales\Model\Order\Invoice.php(395): Mage_Sales_Model_Order_Payment->capture(Object(Mage_Sales_Model_Order_Invoice))
C:\Web\mystore\app\code\core\Mage\Sales\Model\Order\Payment.php(608): Mage_Sales_Model_Order_Invoice->capture()
C:\Web\mystore\app\code\core\Mage\Sales\Model\Order\Payment.php(410): Mage_Sales_Model_Order_Payment->_invoice()
C:\Web\mystore\app\code\core\Mage\Sales\Model\Order\Payment.php(348): Mage_Sales_Model_Order_Payment->capture(NULL)
C:\Web\mystore\app\code\core\Mage\Sales\Model\Order.php(896): Mage_Sales_Model_Order_Payment->place()
C:\Web\mystore\app\code\core\Mage\Sales\Model\Order.php(1114): Mage_Sales_Model_Order->_placePayment()
[internal function]: Mage_Sales_Model_Order->place()
C:\Web\mystore\app\code\core\Mage\Core\Model\Resource\Transaction.php(105): call_user_func(Array)
C:\Web\mystore\app\code\core\Mage\Core\Model\Resource\Transaction.php(159): Mage_Core_Model_Resource_Transaction->_runCallbacks()
C:\Web\mystore\app\code\core\Mage\Sales\Model\Service\Quote.php(189): Mage_Core_Model_Resource_Transaction->save()
C:\Web\mystore\app\code\core\Mage\Sales\Model\Service\Quote.php(249): Mage_Sales_Model_Service_Quote->submitOrder()
C:\Web\mystore\app\code\core\Mage\Paypal\Model\Express\Checkout.php(599): Mage_Sales_Model_Service_Quote->submitAll()
C:\Web\mystore\app\code\core\Mage\Paypal\Controller\Express\Abstract.php(320): Mage_Paypal_Model_Express_Checkout->place('EC-70681376N394...')
C:\Web\mystore\app\code\core\Mage\Core\Controller\Varien\Action.php(418): Mage_Paypal_Controller_Express_Abstract->placeOrderAction()
C:\Web\mystore\app\code\core\Mage\Core\Controller\Varien\Router\Standard.php(254): Mage_Core_Controller_Varien_Action->dispatch('placeOrder')
C:\Web\mystore\app\code\core\Mage\Core\Controller\Varien\Front.php(172): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
C:\Web\mystore\app\code\core\Mage\Core\Model\App.php(365): Mage_Core_Controller_Varien_Front->dispatch()
C:\Web\mystore\app\Mage.php(684): Mage_Core_Model_App->run(Array)
C:\Web\mystore\sg\index.php(81): Mage::run('sg', 'website')
{main}
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You may be caught in the SSL (really TLS) change that began occurring on 2018-06-29 + has now rolled in to almost all PayPal accounts.
PayPal now requires sites initiating payments to PayPal (via links or in your case Magento) only run TLSv1.2+, so only v1.2 + v1.3 are allowed.
If any other protocols are supported by your site, you'll likely see 100% errors initiating payments + the errors won't make sense.
Look at the https://www.ssllabs.com/ss