Amasty Coupons

  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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