customising a payment method

Hello!
Yes, i know there are extentions that will do what i need, but they cover everything when i need a specific thing, and am trying to get the hang of coding stuff for myself!
Anyway, I am trying to customise a cash on delivery payment.
All I need it to do is not take payment straight away (which it does) but only be accessible to a specific customer group.
No matter what I try, it mostly does not work, or occasionally, works but is not hidden.... so i am missing something.
I spat the dummy last night, and must have deleted it, so am starting again from scratch! Anyway, if i figure it out i will update here, any pointers would be great.

I have been trying this
1. EDIT: catalog/model/payment/cod.php

2. FIND:
Code: Select all

$method_data = array();
3. AFTER, ADD:
Code: Select all

if ($this->customer->getCustomerGroupId() != '2') {
$status = false;
}

Change "2" to the id of the customer group you want to allow.

But i think its for an older version, i cannot find the corresponding code on my OC 3.

But i think its for an older version, i cannot find the corresponding code on my OC 3.

I am not sure what you mean ... catalog/model/extension/payment/cod.php file:
does exist on line 20.

DOH!
I could not see it for looking for it!!

Now....
I get internal server error if i add that code snippet..... need to check whats going on

I get internal server error if i add that code snippet..... need to check whats going on

Look at your access logs on your host console's most recent lines for index 500. What do the details provide?