Events are processed by the shopping cart according to their processing order. The lower the number, the higher the priority.
example
An event with a processing order of 0 will take affect before an event with a processing order of 1.
If multiple events have the same processing order, then they are processed according to SID number. Smaller processing numbers are processed first.
example
Three active events all have a processing order of 0. Their SID numbers are 123, 124 and 456. The events with the smaller SID number will be processed first:
First: 123
Next: 124
Last: 456
If Stop processing more Events is selected, then after that event is processed, any events with a larger processing order number will not be processed. In addition, any events with the same processing order number but a larger Event SID number will also not be processed.
more info
More information on an event's Processing Order can be found in the Knowledge Base article on the Event Engine Editor.
Processing order vs. display order
Processing Order is often confused with it's twin sibling Display Order. Processing Order is used to alter the order that specific events will occur in, whereas the Display Order alters the placement of items in a list.
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