I need a simple extension to be included with One Step Checkout.
The extension need to apply a discount created in Promotions > Shopping Cart Price Rules if the shipping selected is 1, 2 or 3 method. also do not apply if 4 or 5 method is selected.
Please be aware that in Promotions > Shopping Cart Price Rules i need to have the option to select if is/or not - contain shipping method apply if not do not apply.
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