Order Total is Zero Still its diverting to Payment Gateway for Payment.

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                          Sub-Total:	₹261.00
      Gift Certificate (TESTV1):	₹-261.00 --> Voucher of 500 Rs is applied here.
                             Total:	₹0.00

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Product Name	  Model	Quantity	Unit Price	Total
TEST	                       TEST	          1	   ₹261.00	₹261.00
                                                             Sub-Total: ₹261.00
                                       India MH State (Weight: 0.29kg): ₹45.00
                                      Gift Certificate (TESTV1):	₹-306.00
                                                                 Total: ₹0.00

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catalog/controller/api/payment.php
catalog/controller/checkout/payment_method.php
catalog/controller/extension/payment/pp_braintree.php
catalog/controller/extension/payment/pp_express.php

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// Payment Methods

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if ($total < 0) {
				$total = 0;
			}

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foreach ($results as $result) {
				if ($this->config->get('payment_' . $result['code'] . '_status')) {
					$this->load->model('extension/payment/' . $result['code']);

					$method = $this->{'model_extension_payment_' . $result['code']}->getMethod($this->session->data['payment_address'], $total);

					if (!empty($method) && is_array($method)) {
						if ($recurring) {
							if (property_exists($this->{'model_extension_payment_' . $result['code']}, 'recurringPayments') && $this->{'model_extension_payment_' . $result['code']}->recurringPayments()) {
								$method_data[$result['code']] = $method;
							}
						} else {
							$method_data[$result['code']] = $method;
						}
					}
				}
			}

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foreach ($results as $result) {
				if ($this->config->get('payment_' . $result['code'] . '_status')) {
					$this->load->model('extension/payment/' . $result['code']);
					
					if ($total == 0 && html_entity_decode(trim(strtolower($result['code'])), ENT_QUOTES, 'UTF-8') == 'free_checkout') {
						$method = $this->{'model_extension_payment_free_checkout'}->getMethod($this->session->data['payment_address'], $total);
					
					} elseif ((float)$total > 0 && html_entity_decode(trim(strtolower($result['code'])), ENT_QUOTES, 'UTF-8') != 'free_checkout') {
						$method = $this->{'model_extension_payment_' . $result['code']}->getMethod($this->session->data['payment_address'], $total);
					}

					if (!empty($method) && is_array($method)) {
						if ($recurring) {
							if (property_exists($this->{'model_extension_payment_' . $result['code']}, 'recurringPayments') && $this->{'model_extension_payment_' . $result['code']}->recurringPayments()) {
								$method_data[$result['code']] = $method;
							}
						} else {
							$method_data[$result['code']] = $method;
						}
					}
				}
			}