Abstract: Systems and methods configured to allow an offer campaign to be specified based on event requirements associated with multiple, different merchants. The event requirements are linked via prerequisite conditions to form the offer campaign. Each event may identify an event related to one merchant (e.g., a payment transaction for a purchase from the merchant) and an optional action to be performed in response to a user satisfying the requirements of the event. Each merchant in the offer campaign is allowed to insert an event related to the merchant, subsequently edit the inserted event, and identify other events in the offer campaign as prerequisite requirements of the event related to the merchant. Merchants may be prevented from inserting or editing events specific to other merchants.