<https://processwire.com/talk/topic/4389-help-in-adding-a-promo-code-to-shopping-cart/>
<http://schema.org/text>
"I have build an online shopping store, but would want to give away a promo code or Gift coupon to some of my customers so that they can avail discounts while they check out. Please tell me what coding should I do or what addition should I do for this feature. \n\n"
<https://processwire.com/talk/topic/4389-help-in-adding-a-promo-code-to-shopping-cart/>