Module seems not working

Avg Bid (AUD)
$8 / hr
Project Budget (AUD)
$2 - $8 / hr

Project Description:
The API for our Fastway module has recently changed, causing it to not work properly anymore. recently made a change to their API. I believe they added new products which has caused our module not to work correctly.
It seems to work when the cart is below 5kg. We are slightly behind with using but I'm scared to upgrade as it might mean too many changes, theme etc.
Anyone can fix it??

Hours of work: 3 Project Duration: < 1 week Skills required:
Open Cart
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$7 / hr
Hours: 3 hr/ week
$8 / hr
Hours: 2 hr/ week