Page Comparison

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1. set_milestone : Initiate milestones for line item groups

   1. To make use of milestones, they must be stored for the order at each of its line_item_groups claimed transition. To do so, the action set_milestone has to be set in the claim transition of the line_item_groups.

2. set_milestone_alert : Schedule alerts to be triggered at milestones cutoffs (plus a delay)

   1. Notifications can be scheduled to be triggerd at the time of milestones cutoffs (plus a certain delay). When triggered, a validity check will be performed to ensure the specified milestone has not yet been reached/acheived. If already reached, notifications won't be triggered.

      1. The time at which the notification will be triggered is the milestone cutoff of the first milestone stored in order_delivery_promises. Cutoffs are sorted based on the sort criteria configured for the site.

   2. A special notification named recompute_cutoffs_sets can be called to recompute the cutoffs for each milestone.

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