Fix Coupon problem for a live eCom site CRELoaded based by bengao

Hi, We need a CRELoaded expert to fix some problems at our live eCommerce website which based on CREloaded pro 6.3. Here is our coupon system problem, we can send our customer coupon code, but when our customer try to redeem it, it always gets error... (Budget: $30-$250 USD, Jobs: AJAX, Javascript, MySQL, PHP, Website Design)
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