partial payment module is used to allow customers to pay some payment in advance and rest of payment after delivery of product item.
1. Admin can set minimum partial payment for order.
2. Option in admin to enable disable partial payment feature.
3. Add manually transaction in customer account against order when customer creates order.
4. In order listing admin check pending amount against that order.
5. Front end customer can check make partial payment equal to or more than minimum amount set by admin.
6. Customer can check in account how much he/she have to pay against order.
7. customer can check there transaction against order after clicking on order view link.
advanced pro partial payment module you can check here :- http://www.opencart.com/index.php?route=extension/extension/info&extension_id=25120
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