Opencart coupons - change cart so that only one coupon can be used per order (stop the customer using multiple various coupons)

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Project Description

I'm using opencart (actually the version Aceshop Joomla- its Opencart and functions the same) and currently the customer can add multiple coupons in the cart.

I need to change it so that the customer can only add 1 coupon per order - then no more are allowed.

This is different to the "Uses Per Sales" and "Uses Per Customer" setting already in opencart. These settings only refer to that specific coupon. I want to stop the customer adding many different coupons.

Ideally this could be a vqmod, otherwise alter php

here is a good description of the problem (but this is not my post) [url removed, login to view]

many thanks

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