Technologies for enhancing payment transactions include an acquirer computing system. The acquirer computing system receives a payment authorization request message for a payment transaction associated with a purchase event and event-specific data corresponding to the purchase event. An offer identification query is transmitted to a promotion management computing system via an out-of-band communications channel. Offer redemption instructions corresponding to a matched offer are received from the promotion management computing system via the out-of-band communications channel. Based on the redemption value of the matched offer, a net transaction amount for the purchase event is determined. The payment authorization request message is modified based on the determined net transaction amount. The modified payment authorization request message is transmitted to an issuer computing system via an in-band communications channel. A payment authorization response message is received from the issuer computing system via the in-band communications channel. Other embodiments are described and claimed.