I would like to give my new customers a discount to encourage them to buy from my site. I believe that I can add a discount when I print the invoice but how does that link in with Worldpay (pre-authorised) processing payments.
If I change the invoice details will this be fed through to Worldpay so that the lower amount is deducted from the customer's card or will they still be charged the initial higher amount?
If I change the invoice details will this be fed through to Worldpay so that the lower amount is deducted from the customer's card or will they still be charged the initial higher amount?
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