FREE Delivery with a coupon V2018

[Truska]

Trying to implement Free Delivery based on a coupon

From the Knowledgebase article at:
https://community.sellerdeck.com/for...-free-shipping

This dates back to 2012 and I have implemented it in v2018 and I do not work
Can not believe after all these years this is not a standard feature of SD but alas it does not seem to be

Anyone know what amendments are need to this code for the latest versions
I am afraid my abilities do not really stretch too understanding the Perl to any great extent.

Thanks

[Mike Hughes]

Which version of the free delivery code are you trying to implement?

The coding looks fairly clear but the one thing that doesn't seem that well explained to me is that where the code has this line (for the single free delivery code example)

 if($::g_PaymentInfo{'COUPONCODE'} eq 'FREE')     # Trying for freedelivery off coupon

then it looks to me as if the 'FREE' bit has to be the same as the coupon code you set up in sellerdeck.