google checkout coupon script php - repost

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Bids
3
Avg Bid (USD)
$180
Project Budget (USD)
$30 - $250

Project Description:
Hi, i needs freelancer having experience in implementing google checkout payment gateway coupon script, here is some detail what i need,

1. i have website with custom eCommerce store, google checkout is implemented also coupon script is ready but the only thing is when i post basket to google checkout shopping cart i donot know how to post the coupon value, that's what i need

Note: i do not need to appply coupon in the google shopping part page i need to send the coupon value i.e 10USD from my custom shopping cart page to google checkout page because i have already few other payment method working on this way , thanks

Skills required:
eCommerce, Shopping Carts, Website Design
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