Fix bug with this addon

Avg Bid (USD)
Project Budget (USD)
$30 - $250

Project Description:
I had this add-on installed but noticed this bug and need it fixed ASAP.
Free shipping works if they checkout with a credit card but if they checkout with PayPal or express PayPal checkout it don't work. So im advertising free shipping but if they checkout with PayPal it don't work. I need this fixed ASAP.

Skills required:
MySQL, OSCommerce, PHP, Website Testing
About the employer:
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