this https://www.opencart.com/index.php?rout ... %20payment module maybe can be suitable for you. There you can add 0.001% for partial payment and amount for payment will be 0.00. But only from OC 2.3 and higher version.
Trader Account $20.00 - OC v. 22.214.171.124 - 126.96.36.199:
With Trader Account extension you can assign various discounts to your customers / traders / merchants
which will be reflected on the whole site. Customers can request a trader account with a message. You will
be than notified via email and through admin panel. You can activate a trader account to your customer and
set a perceptual or static discount on all the products in your store. Also you can send a notification email to
your customer. It is useful if you have want to supply goods for better prices to your merchants from the same
page but maintaining the original prices.
viewtopic.php?f=184&p=721744&sid=58c780 ... d3#p721744
possibly combined with a Payment by Customergroup:
https://www.opencart.com/index.php?rout ... er%20group
For Sale: Top URL's, including an OpenCart V-Pro Shop!
A wide range of matching Designs can be seen here: http://www.opencart.li
For Information on URL's offered, please contact me at: email@example.com
Hundreds of Mods in 380+ Repositories for OC v.1.5.x - v.2.3.x
to be found on my Github Site: https://github.com/IP-CAM
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