Hi,
$item contains what we call the "order product". It also contains the data of the item custom fields.
But "item custom fields" requires HikaShop business and I don't see any license attached to your account.
So I am wondering how you stored this "offer_type" data. And where.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.