The Recurrence Type page specifies whether the discount is applied only once or every bill period.

Select a Recurrence Type:
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One-Time - If checked, the customer receives only one grant or block of units (pools of minutes). If you are creating a discount to be used with an AdvancePay Product, select One-Time. When customers select an AdvancePay plan, they are purchasing one block of units at a time.
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Recurring - If checked, the customer receives new grants or block of units (pools of minutes) every bill period.