Integrating ChompOn with a custom Order Total Module

[mcaraway]

I am trying to integrate Chompon with my konakart store.  I have so far created two classee:

com.konakartadmin.modules.ordertotal.chomponcoupon.ChompOnCoupon
com.konakart.bl.modules.ordertotal.chomponcoupon.ChompOnCoupon

I have also modified the konakartadmin.properties to include chompon like this:
konakart.modules.ordertotal=Shipping SubTotal Tax Total ProductDiscount TotalDiscount ShippingDiscount RewardPoints RedeemPoints GiftCertificate ChompOnCoupon

I see the Order total module in the admin tool and I have installed it and made sure the sort order is before the Total modules sort order.  I was also able to create a ChompOn Promotion in the admin tool.

In my konakart store I've made a input field for the user to input the ChompOn coupon code.  I have connected up the code to retrieve the coupon and deal information from ChompOn.  I have mimiced what the TotalDiscount order total module did in my ChompOnCoupon class. 

So far all this is good.  When I get to the confirmation page though.  The ChompOn code shows up there with the coupon value in the list of order totals, but the total value does not reflect the total amount minus the coupon.  For example,  the totals look like this.

Sub-Total: $17.90
Shipping: $6.00
Chompon Coupon: $3.00
Total: $23.90

The total should be $20.90.

Has anyone made their own Order Total Module?  Or can anyone help figure this out?

Below are the two classes I created:

----------------------------------------------------------------------------------

package com.konakartadmin.modules.ordertotal.chomponcoupon;

import java.util.Date;

import com.konakart.util.Utils;
import com.konakartadmin.app.KKConfiguration;
import com.konakartadmin.bl.KKAdminBase;
import com.konakartadmin.modules.ModuleInterface;
import com.konakartadmin.modules.OrderTotalModule;

public class ChompOnCoupon extends OrderTotalModule {
   /**
    * @return the config key stub
    */
   public String getConfigKeyStub() {
      if (configKeyStub == null) {
         setConfigKeyStub(super.getConfigKeyStub() + "_CHOMPON_COUPON");
      }
      return configKeyStub;
   }

   public String getModuleTitle() {
      return getMsgs().getString(
            "MODULE_ORDER_TOTAL_CHOMPON_COUPON_TEXT_TITLE");
   }

   /**
    * @return the implementation filename
    */
   public String getImplementationFileName() {
      return "ChompOnCoupon";
   }

   /**
    * @return the module sub-type
    */
   public int getModuleSubType() {
      return ModuleInterface.MODULE_SUB_TYPE_PROMOTION;
   }

   /**
    * @return the module code
    */
   public String getModuleCode() {
      return "ot_chompon_coupon";
   }

   /**
    * @return an array of configuration values for this order total module
    */
   public KKConfiguration[] getConfigs() {
      if (configs == null) {
         configs = new KKConfiguration[8];
      }

      if (configs[0] != null
            && !Utils.isBlank(configs[0].getConfigurationKey())) {
         return configs;
      }

      Date now = KKAdminBase.getKonakartTimeStampDate();

      int i = 0;
      int groupId = 6;

      configs = new KKConfiguration(
            /* title */"Total Discount Module Status",
            /* key */"MODULE_ORDER_TOTAL_CHOMPON_COUPON_STATUS",
            /* value */"true",
            /* description */"If set to false, all of the Product Discount promotions will be unavailable",
            /* groupId */groupId,
            /* sortO */i++,
            /* useFun */"",
            /* setFun */"tep_cfg_select_option(array('true', 'false'), ",
            /* dateAdd */now);

      configs = new KKConfiguration(
            /* title */"Sort order of display",
            /* key */"MODULE_ORDER_TOTAL_CHOMPON_COUPON_SORT_ORDER",
            /* value */"22",
            /* description */"Sort Order of Product Discount module on the UI. Lowest is displayed first.",
            /* groupId */groupId,
            /* sortO */i++,
            /* useFun */"",
            /* setFun */"",
            /* dateAdd */now);

      configs = new KKConfiguration(
      /* title */"Publisher ID",
      /* key */"MODULE_ORDER_TOTAL_CHOMPON_COUPON_PID",
      /* value */"22",
      /* description */"Chompon publisher id.",
      /* groupId */groupId,
      /* sortO */i++,
      /* useFun */"",
      /* setFun */"",
      /* dateAdd */now);

      configs = new KKConfiguration(
      /* title */"Authorization Key",
      /* key */"MODULE_ORDER_TOTAL_CHOMPON_COUPON_AUTH",
      /* value */"22",
      /* description */"Chompon authorization key.",
      /* groupId */groupId,
      /* sortO */i++,
      /* useFun */"",
      /* setFun */"",
      /* dateAdd */now);
      /*
       * We don't want the following to be visible since they are used to map
       * data onto the custom fields of the promotion object
       */
      configs = new KKConfiguration(
      /* title */"Minimum Order Value",
      /* key */"MODULE_ORDER_TOTAL_CHOMPON_COUPON_MIN_ORDER_VALUE",
      /* value */"custom1",
      /* description */"The discount only applies if the total of the order,"
            + " equals or is greater than this minimum value",
      /* groupId */groupId,
      /* sortO */i++,
      /* useFun */"invisible",
      /* setFun */"double(0,null)",
      /* dateAdd */now);

      configs = new KKConfiguration(
      /* title */"Apply discount before tax",
      /* key */"MODULE_ORDER_TOTAL_CHOMPON_COUPON_APPLY_BEFORE_TAX",
      /* value */"custom2",
      /* description */"Determines whether all calculations are"
            + " done on amounts before or after tax.",
      /* groupId */groupId,
      /* sortO */i++,
      /* useFun */"invisible",
      /* setFun */"tep_cfg_select_option(array('true', 'false'), ",
      /* dateAdd */now);

      configs = new KKConfiguration(
      /* title */"ChompOn Deal ID",
      /* key */"MODULE_ORDER_TOTAL_CHOMPON_COUPON_DEAL_ID",
      /* value */"custom3",
      /* description */"ChompOn Deal ID",
      /* groupId */groupId,
      /* sortO */i++,
      /* useFun */"invisible",
      /* setFun */"",
      /* dateAdd */now);

      configs = new KKConfiguration(
      /* title */"Coupon Value",
      /* key */"MODULE_ORDER_TOTAL_CHOMPON_COUPON_DISCOUNT",
      /* value */"custom4",
      /* description */"The actual discount for the promotion"
            + " It represents an amount in dollars the coupon is worth.",
      /* groupId */groupId,
      /* sortO */i++,
      /* useFun */"invisible",
      /* setFun */"double(0,null)",
      /* dateAdd */now);
      return configs;
   }
}


----------------------------------------------------------------------------------

package com.konakart.bl.modules.ordertotal.chomponcoupon;
import java.math.BigDecimal;
import java.util.HashMap;
import java.util.Locale;
import java.util.ResourceBundle;

import org.apache.torque.TorqueException;

import com.carawaytea.chompon.ChompOnImpl;
import com.carawaytea.chompon.domain.Coupon;
import com.carawaytea.chompon.domain.Deal;
import com.konakart.app.KKConfiguration;
import com.konakart.app.KKException;
import com.konakart.app.Order;
import com.konakart.app.OrderTotal;
import com.konakart.app.Promotion;
import com.konakart.appif.KKEngIf;
import com.konakart.bl.modules.BaseModule;
import com.konakart.bl.modules.ordertotal.BaseOrderTotalModule;
import com.konakart.bl.modules.ordertotal.OrderTotalInterface;
import com.workingdogs.village.DataSetException;

public class ChompOnCoupon extends BaseOrderTotalModule implements OrderTotalInterface{

    private static int sortOrder = -1;
    private static String pid = "";
    private static String auth = "";

    private static String code = "ot_chompon_coupon";

    private static String bundleName = BaseModule.basePackage
            + ".ordertotal.chomponcoupon.ChompOnCoupon";

    private static HashMap<Locale, ResourceBundle> resourceBundleMap = new HashMap<Locale, ResourceBundle>();

    private static String mutex = "otChompOnCouponMutex";

    // Configuration Keys

    private final static String MODULE_ORDER_TOTAL_CHOMPON_COUPON_SORT_ORDER = "MODULE_ORDER_TOTAL_CHOMPON_COUPON_SORT_ORDER";
    private final static String MODULE_ORDER_TOTAL_CHOMPON_COUPON_STATUS = "MODULE_ORDER_TOTAL_CHOMPON_COUPON_STATUS";
    private final static String MODULE_ORDER_TOTAL_CHOMPON_COUPON_PID = "MODULE_ORDER_TOTAL_CHOMPON_COUPON_PID";
    private final static String MODULE_ORDER_TOTAL_CHOMPON_COUPON_AUTH = "MODULE_ORDER_TOTAL_CHOMPON_COUPON_AUTH";

    // Message Catalogue Keys
    // private final static String MODULE_ORDER_TOTAL_CHOMPON_COUPON_TITLE =
    // "module.order.total.productdiscount.title";

    /**
     * Constructor
     *
     * @param eng
     *
     * @throws DataSetException
     * @throws KKException
     * @throws TorqueException
     *
     */
    public ChompOnCoupon(KKEngIf eng) throws TorqueException, KKException, DataSetException
    {
        super.init(eng);

        // Create the static maps from the configuration info
        if (sortOrder == -1)
        {
            synchronized (mutex)
            {
                if (sortOrder == -1)
                {
                    setStaticVariables();
                }
            }
        }
    }

    /**
     * Sets some static variables during setup
     *
     * @throws KKException
     *
     */
    public void setStaticVariables() throws KKException
    {
        KKConfiguration conf;

        conf = getEng().getConfiguration(MODULE_ORDER_TOTAL_CHOMPON_COUPON_SORT_ORDER);
        if (conf == null)
        {
            sortOrder = 0;
        } else
        {
            sortOrder = new Integer(conf.getValue()).intValue();
        }
       
        conf = getEng().getConfiguration(MODULE_ORDER_TOTAL_CHOMPON_COUPON_PID);
        if (conf == null)
        {
            pid = "";
        } else
        {
            pid = conf.getValue();
        }
       
        conf = getEng().getConfiguration(MODULE_ORDER_TOTAL_CHOMPON_COUPON_AUTH);
        if (conf == null)
        {
            auth = "";
        } else
        {
            auth = conf.getValue();
        }
    }

    /**
     * Returns true or false
     *
     * @throws KKException
     */
    public boolean isAvailable() throws KKException
    {
        return isAvailable(getEng(), MODULE_ORDER_TOTAL_CHOMPON_COUPON_STATUS);
    }

    /**
     * Create and return an OrderTotal object for the discount amount.
     *
     * @param order
     * @param dispPriceWithTax
     * @param locale
     * @return Returns an OrderTotal object for this module
     * @throws Exception
     */
    public OrderTotal getOrderTotal(Order order, boolean dispPriceWithTax, Locale locale)
            throws Exception
    {
        OrderTotal ot;

        // Get the resource bundle
        ResourceBundle rb = getResourceBundle(mutex, bundleName, resourceBundleMap, locale);
        if (rb == null)
        {
            throw new KKException("A resource file cannot be found for the country "
                    + locale.getCountry());
        }
        String couponId = order.getCustom1();
        ChompOnImpl chompon = new ChompOnImpl();
        if ("".equals(couponId))
           return null;
       
      Coupon coupon = chompon.getCouponInfo(pid, auth, couponId);

        // Get the promotions
        Promotion[] promArray = getPromMgr().getPromotions(code, order);

        if (promArray != null && promArray.length > 0)
        {

            Promotion promotion = getPromotion(promArray, coupon);

            if (promotion == null)
               return null;
            /*
             * Get the configuration parameters from the promotion
             */
           
            // Minimum value for order
            BigDecimal minTotalOrderVal = getCustomBigDecimal(promotion.getCustom1(), 1);

            // If set to true, points are calculated on pre-tax value.
            boolean applyBeforeTax = getCustomBoolean(promotion.getCustom2(), 2);
           
            // coupon value
            //BigDecimal couponValue = getCustomBigDecimal(promotion.getCustom4(), 1);

            // Get the order value
            BigDecimal orderValue = null;
            if (applyBeforeTax)
            {
                /*
                 * We do the following calculation instead of using order.getTotalExTax() since this
                 * will not contain any promotional discounts that may have been added
                 */
                orderValue = order.getTotalIncTax().subtract(order.getTax());
            } else
            {
                orderValue = order.getTotalIncTax();
            }

            // Remove shipping charges if configured to not include
            if (order.getShippingQuote() != null)
            {
                if (applyBeforeTax && order.getShippingQuote().getTotalExTax() != null)
                {
                    orderValue = orderValue.subtract(order.getShippingQuote().getTotalExTax());
                } else if (!applyBeforeTax && order.getShippingQuote().getTotalIncTax() != null)
                {
                    orderValue = orderValue.subtract(order.getShippingQuote().getTotalIncTax());
                }
            }

            // If promotion doesn't cover any of the products in the order then leave
            if (promotion.getApplicableProducts() == null
                    || promotion.getApplicableProducts().length == 0)
            {
                return null;
            }

            ot = new OrderTotal();
            ot.setSortOrder(sortOrder);
            ot.setClassName(code);
            ot.setPromotions(new Promotion[]
            { promotion });

            // Does promotion only apply to a min order value ?
            if (minTotalOrderVal != null)
            {
                if (orderValue.compareTo(minTotalOrderVal) < 0)
                {
                    // If we haven't reached the minimum amount then leave
                    return null;
                }
            }
           
          Deal deal = chompon.getDeal(pid, auth, coupon.getDealID());
          if (deal != null)
          {
             ot = new OrderTotal();
                ot.setSortOrder(sortOrder);
                ot.setClassName(code);
               
                BigDecimal discount = new BigDecimal(deal.getValue());
                ot.setValue(discount);
                ot.setText("-"
                        + getCurrMgr().formatPrice(ot.getValue(),
                                order.getCurrencyCode()));
                ot.setTitle("ChompOn Coupon:" );
                if (ot.getValue() != null)
                {
                    int scale = new Integer(order.getCurrency().getDecimalPlaces()).intValue();
                    ot.setValue(ot.getValue().setScale(scale, BigDecimal.ROUND_HALF_UP));
                    return ot;
                }
          }
        }

        // Return null if there are no promotions
        return null;
    }

    private Promotion getPromotion(Promotion[] promArray, Coupon coupon) throws KKException {
      for (Promotion promotion: promArray) {
            String dealID = getCustomString(promotion.getCustom3(), 3);
         if (dealID != null && dealID.equals(coupon.getDealID()))
            return promotion;
      }
      return null;
   }

   public int getSortOrder()
    {
        return sortOrder;
    }

    public String getCode()
    {
        return code;
    }
}

[trevor]

What you need to do is to subtract your discount from the total of the order:

order.setTotalIncTax(order.getTotalIncTax().subtract(selectedOT.getValue()));

[mcaraway]

thought I would update you on my progress.  I decided to go back to scratch.  I restarted by taking the TotalDiscount order total module and renaming it to ChompOnDeal.  I didn't change anything at first.  I just wanted to see it work on it's own.  That worked. 

Then I added the necessary ChompOn data I needed in the konakartadmin module part.  I also changed the konakart module to calculate the order total value based on the ChompOn coupon value.  In truth, I cut and pasted the same code as my first attempt into place.   

For some reason, that worked perfectly.  I am not sure what is different about the old code that makes it fail.  I've copied the code below in case anyone is curious.

konakart ChompOnDeal class:

//
// (c) 2006 DS Data Systems UK Ltd, All rights reserved.
//
// DS Data Systems and KonaKart and their respective logos, are
// trademarks of DS Data Systems UK Ltd. All rights reserved.
//
// The information in this document is free software; you can redistribute
// it and/or modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This software is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//

package com.konakart.bl.modules.ordertotal.chompondeal;

import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.ResourceBundle;

import org.apache.torque.TorqueException;

import com.carawaytea.chompon.ChompOnImpl;
import com.carawaytea.chompon.domain.Coupon;
import com.carawaytea.chompon.domain.Deal;
import com.konakart.app.KKConfiguration;
import com.konakart.app.KKException;
import com.konakart.app.Order;
import com.konakart.app.OrderTotal;
import com.konakart.app.Promotion;
import com.konakart.appif.KKEngIf;
import com.konakart.bl.modules.BaseModule;
import com.konakart.bl.modules.ordertotal.BaseOrderTotalModule;
import com.konakart.bl.modules.ordertotal.OrderTotalInterface;
import com.workingdogs.village.DataSetException;

/**
* Module that creates an OrderTotal object for applying a percentage discount
* or an amount discount on the order. The discount may be applied on the total
* value of the order before or after tax.
*
* The promotion may be activated only if:
* <ul>
* <li>The total amount of the order is greater than a minimum amount</li>
* <li>The total number of products ordered is greater than a minimum amount</li>
* <li>The total number of a single product ordered is greater than a minimum
* amount</li>
* </ul>
*
* There may be multiple valid promotions applicable for an order. If this is
* the case, the logic applied is the following: All cumulative promotions are
* summed into one order total object. Then we loop through the order total
* objects and choose the one that offers the largest discount.
*/
public class ChompOnDeal extends BaseOrderTotalModule implements
      OrderTotalInterface {

   private static int sortOrder = -1;

   private static String code = "ot_chompon_deal";
   private static String pid = "";
   private static String auth = "";

   private static String bundleName = BaseModule.basePackage
         + ".ordertotal.chompondeal.ChompOnDeal";

   private static HashMap<Locale, ResourceBundle> resourceBundleMap = new HashMap<Locale, ResourceBundle>();

   private static String mutex = "otChompOnDealMutex";

   // Configuration Keys

   private final static String MODULE_ORDER_TOTAL_CHOMPON_DEAL_SORT_ORDER = "MODULE_ORDER_TOTAL_CHOMPON_DEAL_SORT_ORDER";

   private final static String MODULE_ORDER_TOTAL_CHOMPON_DEAL_STATUS = "MODULE_ORDER_TOTAL_CHOMPON_DEAL_STATUS";

   // Message Catalogue Keys
//   private final static String MODULE_ORDER_TOTAL_CHOMPON_DEAL_TITLE = "module.order.total.chompondeal.title";
   

   private final static String MODULE_ORDER_TOTAL_CHOMPON_COUPON_PID = "MODULE_ORDER_TOTAL_CHOMPON_COUPON_PID";
   private final static String MODULE_ORDER_TOTAL_CHOMPON_COUPON_AUTH = "MODULE_ORDER_TOTAL_CHOMPON_COUPON_AUTH";

   /**
    * Constructor
    *
    * @param eng
    *
    * @throws DataSetException
    * @throws KKException
    * @throws TorqueException
    *
    */
   public ChompOnDeal(KKEngIf eng) throws TorqueException, KKException,
         DataSetException {
      super.init(eng);

      // Create the static maps from the configuration info
      if (sortOrder == -1) {
         synchronized (mutex) {
            if (sortOrder == -1) {
               setStaticVariables();
            }
         }
      }
   }

   /**
    * Sets some static variables during setup
    *
    * @throws KKException
    *
    */
   public void setStaticVariables() throws KKException {
      KKConfiguration conf;

      conf = getEng().getConfiguration(
            MODULE_ORDER_TOTAL_CHOMPON_DEAL_SORT_ORDER);
      if (conf == null) {
         sortOrder = 0;
      } else {
         sortOrder = new Integer(conf.getValue()).intValue();
      }

      conf = getEng().getConfiguration(MODULE_ORDER_TOTAL_CHOMPON_COUPON_PID);
      if (conf == null) {
         pid = "";
      } else {
         pid = conf.getValue();
      }

      conf = getEng()
            .getConfiguration(MODULE_ORDER_TOTAL_CHOMPON_COUPON_AUTH);
      if (conf == null) {
         auth = "";
      } else {
         auth = conf.getValue();
      }
   }

   /**
    * Returns true or false
    *
    * @throws KKException
    */
   public boolean isAvailable() throws KKException {
      return isAvailable(getEng(), MODULE_ORDER_TOTAL_CHOMPON_DEAL_STATUS);
   }

   /**
    * Create and return an OrderTotal object for the discount amount.
    *
    * @param order
    * @param dispPriceWithTax
    * @param locale
    * @return Returns an OrderTotal object for this module
    * @throws Exception
    */
   public OrderTotal getOrderTotal(Order order, boolean dispPriceWithTax,
         Locale locale) throws Exception {
      OrderTotal ot;

      // Get the resource bundle
      ResourceBundle rb = getResourceBundle(mutex, bundleName,
            resourceBundleMap, locale);
      if (rb == null) {
         throw new KKException(
               "A resource file cannot be found for the country "
                     + locale.getCountry());
      }

      // First see if the user even entered a chompon coupon
      String couponId = order.getCustom1();
      if ("".equals(couponId))
         return null;

      ChompOnImpl chompon = new ChompOnImpl();
      Coupon coupon = chompon.getCouponInfo(pid, auth, couponId);

      // If the coupon doesn't exist or is no longer valid then return
      if (coupon == null || !coupon.isValid())
         return null;
      // Get the promotions
      Promotion[] promArray = getPromMgr().getPromotions(code, order);

      // List to contain an order total for each promotion
      List<OrderTotal> orderTotalList = new ArrayList<OrderTotal>();

      if (promArray != null) {

         for (int i = 0; i < promArray.length; i++) {
            Promotion promotion = promArray;

            //If the deal does not match the ChompOn Coupon Deal then continue
            String dealID = getCustomString(promotion.getCustom7(), 7);
            if (dealID == null || !dealID.equals(coupon.getDealID()))
               continue;
            
            /*
             * Get the configuration parameters from the promotion
             */

            // Minimum value for order
            BigDecimal minTotalOrderVal = getCustomBigDecimal(
                  promotion.getCustom1(), 1);

            // Minimum total quantity of products ordered
            int minTotalQuantity = getCustomInt(promotion.getCustom2(), 2);

            // Need to order at least this quantity of a single product for
            // promotion to apply
            int minProdQuantity = getCustomInt(promotion.getCustom3(), 3);

            // Actual discount. Could be a percentage or an amount.
            BigDecimal discountApplied = getCustomBigDecimal(
                  promotion.getCustom4(), 4);

            // If set to true it is a percentage. Otherwise it is an amount.
//            boolean percentageDiscount = getCustomBoolean(
//                  promotion.getCustom5(), 5);

            // If set to true, discount is applied to pre-tax value. Only
            // relevant for
            // percentage discount.
            boolean applyBeforeTax = getCustomBoolean(
                  promotion.getCustom6(), 6);

            // Don't bother going any further if there is no discount
            if (discountApplied == null
                  || discountApplied.equals(new BigDecimal(0))) {
               continue;
            }

            // Get the order value
            BigDecimal orderValue = null;
            if (applyBeforeTax) {
               orderValue = order.getSubTotalExTax();
            } else {
               orderValue = order.getSubTotalIncTax();
            }

            // If promotion doesn't cover any of the products in the order
            // then go on to the
            // next promotion
            if (promotion.getApplicableProducts() == null
                  || promotion.getApplicableProducts().length == 0) {
               continue;
            }

            ot = new OrderTotal();
            ot.setSortOrder(sortOrder);
            ot.setClassName(code);
            ot.setPromotions(new Promotion[] { promotion });

            // Does promotion only apply to a min order value ?
            if (minTotalOrderVal != null) {
               if (orderValue.compareTo(minTotalOrderVal) < 0) {
                  // If we haven't reached the minimum amount then
                  // continue to the next
                  // promotion
                  continue;
               }
            }

            // Does promotion only apply to a minimum number of products
            // ordered ?
            if (minTotalQuantity > 0) {
               int total = 0;
               for (int j = 0; j < promotion.getApplicableProducts().length; j++) {
                  total += order.getOrderProducts()[j].getQuantity();
               }
               if (total < minTotalQuantity) {
                  // If we haven't reached the minimum total then continue
                  // to the next
                  // promotion
                  continue;
               }
            }

            // Does promotion only apply to a minimum number of single
            // products ordered ?
            if (minProdQuantity > 0) {
               boolean foundMin = false;
               for (int j = 0; j < promotion.getApplicableProducts().length; j++) {
                  if (order.getOrderProducts()[j].getQuantity() >= minProdQuantity) {
                     foundMin = true;
                  }
               }
               if (!foundMin) {
                  // If we haven't reached the minimum total then continue
                  // to the next
                  // promotion
                  continue;
               }
            }
            
            Deal deal = chompon.getDeal(pid, auth, coupon.getDealID());
            if (deal != null) {
               BigDecimal discount = new BigDecimal(deal.getValue());
               ot.setValue(discount);
               int scale = new Integer(order.getCurrency().getDecimalPlaces())
                     .intValue();
               ot.setValue(ot.getValue().setScale(scale,
                     BigDecimal.ROUND_HALF_UP));
               ot.setText("-"
                     + getCurrMgr().formatPrice(ot.getValue(),
                           order.getCurrencyCode()));
               ot.setTitle("ChompOn Coupon:");
            }

            orderTotalList.add(ot);
         }
      } else {
         // Return null if there are no promotions
         return null;
      }

      // Call a helper method to decide which OrderTotal we should return
      OrderTotal retOT = getDiscountOrderTotalFromList(order, orderTotalList);

      return retOT;

   }

   public int getSortOrder() {
      return sortOrder;
   }

   public String getCode() {
      return code;
   }
}


konakartadmin code:
//
// (c) 2006 DS Data Systems UK Ltd, All rights reserved.
//
// DS Data Systems and KonaKart and their respective logos, are
// trademarks of DS Data Systems UK Ltd. All rights reserved.
//
// The information in this document is free software; you can redistribute
// it and/or modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This software is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//

package com.konakartadmin.modules.ordertotal.chompondeal;

import java.util.Date;

import com.konakart.util.Utils;
import com.konakartadmin.app.KKConfiguration;
import com.konakartadmin.bl.KKAdminBase;
import com.konakartadmin.modules.ModuleInterface;
import com.konakartadmin.modules.OrderTotalModule;

/**
* ChompOn Deal order total module
*
*/
public class ChompOnDeal extends OrderTotalModule
{
    /**
     * @return the config key stub
     */
    public String getConfigKeyStub()
    {
        if (configKeyStub == null)
        {
            setConfigKeyStub(super.getConfigKeyStub() + "_CHOMPON_DEAL");
        }
        return configKeyStub;
    }

    public String getModuleTitle()
    {
        return getMsgs().getString("MODULE_ORDER_TOTAL_CHOMPON_DEAL_TEXT_TITLE");
    }

    /**
     * @return the implementation filename
     */
    public String getImplementationFileName()
    {
        return "ChompOnDeal";
    }
   
    /**
     * @return the module sub-type
     */
    public int getModuleSubType()
    {
        return ModuleInterface.MODULE_SUB_TYPE_PROMOTION;
    }
   
    /**
     * @return the module code
     */
    public String getModuleCode()
    {
        return "ot_chompon_deal";
    }

    /**
     * @return an array of configuration values for this order total module
     */
    public KKConfiguration[] getConfigs()
    {
        if (configs == null)
        {
            configs = new KKConfiguration[11];
        }

        if (configs[0] != null && !Utils.isBlank(configs[0].getConfigurationKey()))
        {
            return configs;
        }

        Date now = KKAdminBase.getKonakartTimeStampDate();

        int i = 0;
        int groupId = 6;

        configs = new KKConfiguration(
                /* title */"Total ChompOn Deal Module Status",
                /* key */"MODULE_ORDER_TOTAL_CHOMPON_DEAL_STATUS",
                /* value */"true",
                /* description */"If set to false, all of the ChompOn Deal promotions will be unavailable",
                /* groupId */groupId,
                /* sortO */i++,
                /* useFun */"",
                /* setFun */"tep_cfg_select_option(array('true', 'false'), ",
                /* dateAdd */now);

        configs = new KKConfiguration(
                /* title */"Sort order of display",
                /* key */"MODULE_ORDER_TOTAL_CHOMPON_DEAL_SORT_ORDER",
                /* value */"20",
                /* description */"Sort Order of ChompOn Deal module on the UI. Lowest is displayed first.",
                /* groupId */groupId,
                /* sortO */i++,
                /* useFun */"",
                /* setFun */"",
                /* dateAdd */now);
       
      configs = new KKConfiguration(
            /* title */"Publisher ID",
            /* key */"MODULE_ORDER_TOTAL_CHOMPON_COUPON_PID",
            /* value */"22",
            /* description */"Chompon publisher id.",
            /* groupId */groupId,
            /* sortO */i++,
            /* useFun */"",
            /* setFun */"",
            /* dateAdd */now);

      configs = new KKConfiguration(
            /* title */"Authorization Key",
            /* key */"MODULE_ORDER_TOTAL_CHOMPON_COUPON_AUTH",
            /* value */"22",
            /* description */"Chompon authorization key.",
            /* groupId */groupId,
            /* sortO */i++,
            /* useFun */"",
            /* setFun */"",
            /* dateAdd */now);       

        /*
         * We don't want the following to be visible since they are used to map data onto the custom
         * fields of the promotion object
         */
        configs = new KKConfiguration(
        /* title */"Minimum Order Value",
        /* key */"MODULE_ORDER_TOTAL_CHOMPON_DEAL_MIN_ORDER_VALUE",
        /* value */"custom1",
        /* description */"The discount only applies if the total of the order,"
                + " equals or is greater than this minimum value",
        /* groupId */groupId,
        /* sortO */i++,
        /* useFun */"invisible",
        /* setFun */"double(0,null)",
        /* dateAdd */now);

        configs = new KKConfiguration(
        /* title */"Min total quantity",
        /* key */"MODULE_ORDER_TOTAL_CHOMPON_DEAL_MIN_TOTAL_QUANTITY",
        /* value */"custom2",
        /* description */"The discount only applies if the number of products ordered,"
                + " equals or is greater than this minimum value",
        /* groupId */groupId,
        /* sortO */i++,
        /* useFun */"invisible",
        /* setFun */"integer(0,null)",
        /* dateAdd */now);

        configs = new KKConfiguration(
        /* title */"Min quantity for a product",
        /* key */"MODULE_ORDER_TOTAL_CHOMPON_DEAL_MIN_SINGLE_PROD_QUANTITY",
        /* value */"custom3",
        /* description */"The discount only applies on the total if the quantity of at least one"
                + " single product, equals or is greater than this minimum value.",
        /* groupId */groupId,
        /* sortO */i++,
        /* useFun */"invisible",
        /* setFun */"integer(0,null)",
        /* dateAdd */now);

        configs = new KKConfiguration(
        /* title */"Discount",
        /* key */"MODULE_ORDER_TOTAL_CHOMPON_DEAL",
        /* value */"custom4",
        /* description */"The actual discount for the promotion"
                + " It may represent a percentage discount or an amount discount.",
        /* groupId */groupId,
        /* sortO */i++,
        /* useFun */"invisible",
        /* setFun */"double(0,null)",
        /* dateAdd */now);

        configs = new KKConfiguration(
        /* title */"Percent / Amount",
        /* key */"MODULE_ORDER_TOTAL_CHOMPON_DEAL_PERCENT",
        /* value */"custom5",
        /* description */"If true, the discount is a percentage." + " Otherwise it is an amount",
        /* groupId */groupId,
        /* sortO */i++,
        /* useFun */"invisible",
        /* setFun */"tep_cfg_select_option(array('true', 'false'), ",
        /* dateAdd */now);

        configs = new KKConfiguration(
        /* title */"Apply discount before tax",
        /* key */"MODULE_ORDER_TOTAL_CHOMPON_DEAL_APPLY_BEFORE_TAX",
        /* value */"custom6",
        /* description */"Determines whether all calculations are"
                + " done on amounts before or after tax.",
        /* groupId */groupId,
        /* sortO */i++,
        /* useFun */"invisible",
        /* setFun */"tep_cfg_select_option(array('true', 'false'), ",
        /* dateAdd */now);


      configs = new KKConfiguration(
      /* title */"ChompOn Deal ID",
      /* key */"MODULE_ORDER_TOTAL_CHOMPON_COUPON_DEAL_ID",
      /* value */"custom7",
      /* description */"ChompOn Deal ID",
      /* groupId */groupId,
      /* sortO */i++,
      /* useFun */"invisible",
      /* setFun */"",
      /* dateAdd */now);       
        return configs;
    }
}