In one aspect, a computing apparatus is configured to allow merchants to initiate offers in an offer campaign based on a spending pattern specified by the merchant, such as the lack of transactions in a predetermined period of time of the day, in a recent time period, and/or in a particular merchant category. The offer campaign can be adjusted between offer delivery/announcement and fulfillment for a limited time period. The benefit of a further purchase may be announced via a message scheduled to be transmitted in response to an event identifying the arrival of a particular time instance, in response to a qualification notification of a transaction satisfying the requirements of a purchase event required in the offer campaign, or in response to the detection of a required spending pattern.