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