Magento-2.1.1 : "400 (Bad Request)" issue generate while place order using custom payment method not Display Error Message on page.
Error Log also empty..
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I Have Fixed The Issue By Editing A Core File
Magento\Checkout\Model\PaymentInformationManagement inside this i have replaced content of function
savePaymentInformationAndPlaceOrder with following
$this->savePaymentInformation($cartId, $paymentMethod, $billingAddress);
(Change : Remove The Try/Catch Block)
Note : Please Use A Plugin To Change Core System