Add-On

An add-on is an additional flat fee that can be included with a price plan. Add-ons for a price plan can be selected when subscribing a customer to that plan, and only the ones included in the subscription end up on the customer’s invoice. For example, add-ons can be used to let customers pay for prioritized phone support as part of their subscription.

Definition:

Field Name	Description	Type	Required
Feature	The given feature you want to tack onto the price plan	[Feature]	Required
Price	The cost of this add-on	Float	Required
Quantity Enabled	Allow your customers to attach multiples of this add-on	Boolean	Optional
Limit	If “Quantity Enabled” is true, this is the maximum number of add-ons the customer can use	Integer	Optional
Immediately Charge	If the “immediately charge” option is set for an add on, an invoice will be immediately created for the add on when it is attached to the subscription - the customer will get an invoice at the add-on's start time, or immediately if the start time is in the past	Boolean	Optional

Add-ons are charged at the end of the billing cycle (or at the beginning with upfront billing) and are included in all invoices as separate line items. Add-ons can be charged at a frequency of once per billing cycle, or once per subscription (see the screenshot below).

An example of a single use add-on might be an optional initiation fee or a set-up cost.