Amasty Coupons integration with Firecheckout

1. Open app/code/community/Amasty/Coupons/Block/Rewrite/Cart/Coupon.php and find the following code:

protected function _toHtml()
  {
      $this->setTemplate('amcoupon/checkout/cart/coupon.phtml');
      return parent::_toHtml();
  }

2. Replace it with:

protected function _toHtml()
  {
      $this->setTemplate('amcoupon/checkout/cart/coupon.phtml');
      if ('firecheckout' === $this->getRequest()->getRouteName()) {
          $this->setTemplate('tm/firecheckout/amcoupon/checkout/cart/coupon.phtml');
      }
      return parent::_toHtml();
  }

and save the file. 3. Disable compilation mode and clear Magento cache.

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