Adding a Payment Method

Hello again.
I recently needed to create a new method (or customize other), but i want to create one that will not be deleted or rollbacked after each Hikashop update.
My idea was to create a new method and customize it how i want.

I just want to know what i need to do to add a new payment plugin?
I add a new folder at: HOME/administrator/components/com_hikashop/extensions and HOME/plugins/hikashoppayment. and configured the xmls, tho still is not showing at the back-end payment methods.

Any advices?

NOTE: if is there a way to download a zip of a plugin payment, that will be great.

Good it worked, i copied an existing payment method and changed is params and name. Although now when i try to go to back-end payment configuration it displays an error:

Order status
Fatal error: Call to a member function display() on a non-object in ...

I need this params because it defines the types of order status.
What may be the caus of that?

that all.. the rest is location.

Fatal error: Call to a member function display() on a non-object in HOME/plugins/hikashoppayment/pelecard/pelecard_configuration.php on line 18

The line 18 is:

<?php echo $this->data->display("data[payment][payment_params][order_status]",@$this->element->payment_params->order_status); ?>

OK i found out what was the problem after adding those lines.

thank you again.