This shortcode enables you to place a button on the page to perform a one click upsell. This feature replaces the alternate method of executing a one click upsell by using Actionsets. The advantage of using this shortcode is that the payment on the order is processed immediately, unlike using an actionset, which can take up to 6 hours to process the invoice payment. The advantage of this is that you (and your customer) will know immediately if the payment succeeded.

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