Modify tax calculation

Hi!

In Sweden we calculate tax on shipping in a special way, I don´t know if other countries do the same. If a VAT of for example 6% is applied to 40% of the order total and a VAT of 25% is applied to 60% of the order total, then 6% VAT is applied to 40% of the shipping cost, and 25% VAT is applied to 60% of the shipping cost, and so on.

Now my problem is that in one way or the other I want to modify HikaShop so that tax on shipping is calculated in this way. First I tried creating a plugin which would modify the tax calculation, but I couldn´t make it work. Then I have been looking at the source code for Hika Shop to find the appropriate place to insert my own code for tax calculation, but I don´t understand where I should put my code.

Is there a single file and piece of code where I could put my code, or will I have to put it in several places? Could anyone in this forum help me understand in which files and code parts I need to insert my code so that the correct tax on shipping and tax total will be calculated, displayed and saved to the database in every relevant part of the shop?

Our website uses Joomla 1.5.25 and HikaShop Starter 2.0.0

Kaj Westin

Hi there,

Your issue seems quite complexe! I hope you have some great basis in php
Anyway if you want to set up that kind of rules the best way is to create an Hikashop plugin which will works just before the order creation.
You can take a look at the documentation for more information. In Your case you'll probably have to use the trigger onBeforeOrderCreate.

Good luck!

Hi and thank´s for your answer!

I first tried to solve my problem by creating a plugin, that´s definitely the natural way that one want´s to solve this. But I couldn´t get it right. But I will give it another try.

You recommend to handle the trigger onBeforeOrderCreate, I will do that. And I guess I also need to handle the trigger onBeforeOrderUpdate the same way in case the order is changed?

I´ll get back in this thread later on, either with more questions or telling you the plugin-strategy solved the problem

Hi,

Yes you will have to handle the trigger onBeforeOrderUpdate too.

Thanks for developing this plugin.

Hi again,

Using onBeforeOrderCreate makes it possible for me to access all information about the order and that´s great. But my problem is that when I go to the cart to start my checkout from the shop (and choose paymenttype, shippingtype and so on) I need to be able to modify the VAT and the rest of the data that is shown on the webpage. But onBeforeOrderCreate doesn´t let me manipulate the prices until the customer confirms the order and the order confirmation page is shown. On that page the prices and VAT is correct, but I need to get the data right on the first page too.

I can´t accomplish this with the plugins, can I?

/Kaj

Thank you Nicolas, I will have a look at that!

/Kaj

Hi again!

If I create a plugin that implements the function "hikashop_product_price_for_quantity_in_cart(&$product)", how can I then from the plugin access the shipping cost, as the shipping cost is shown in the cart, before the order has been created?

To me it seems as if I can only access every individual product in the function "hikashop_product_price_for_quantity_in_cart(&$product)", not any shipping cost "parameter"?

Is there any good descriptions of the API for all the classes of Hikashop?

/Kaj

Thank you for your patience with a newbie...

Where do I find the shipping plugin that you are thinking of? In "plugins/hikashopshipping"?

/Kaj

Yes you can find the shipping in "plugins/hikashopshipping". Then duplicate the plugin used.