Campaigns are evaluated in order of priority (highest first). The first matching campaign will be applied. If campaigns are set to stack, all matching campaigns will be applied. If a campaign is set to be exclusive, other campaigns will be ignored.
Percentage campaigns: Give a percentage of the order total as store credit.
Fixed campaigns: Give a fixed amount of store credit per order.
Newsletter Signup Campaigns: Give any new subscriber a fixed amount of store credit, as an incentive.