Developing payment plugin with input fields

-- HikaShop version -- : 2.4.0
-- Joomla version -- : 3.4.1
-- PHP version -- : 5.5

I am trying to develop a payment plugin.

What is required is to have the buyer select an institution from a list giving a code for electronic invoicing. The order is then exported to our main system where we process the orders and send out invoices.

I need a little help on two things:

Firstly I need to add two input fields on the checkout page that relates to this specific payment plugin. (This is one of several payment methods, the fields will be hidden when another payment method is selected, that is done by javascript)

Secondly I need to store the values from the fields in the payment information in the order.

Can you give any advice on how to do it, perhaps there is a similar functionality in some of the existing payment plugins (I haven't been able to find it, though).

Hi.

Thank you for your reply.

The svea plugin is far to complex for our needs. The credit card plugin seems to be highly coupled to the HikashopPaymentPlugin class, defining the available fields.

I will soldering on for now, hopefully finding a way forward.

Hi again.

I sorry to say that I have come very far with the payment plugin.

I just need one field (I originally thought I needed 2) that shows up on the checkout form. HikaShop would in this case not handle the payment at all, sending invoices would be handled externally.

The field would be filled with data and the buyer can select the correct company to be invoiced. Then the payment plugin reads the selected value, stores it in the order.

Can something be done with say a tmpl directory and a view?

It would have saved me quite some time, if you had directed me to the purchaseorder payment plugin in the first place.

I found that after grepping "custom_html".

It seems to me to be the most simple payment plugin with custom fields.