You can define a billing trigger condition for each product using a property. Learn how to create this property in HubSpot.

1. Navigate to Settings > Data Management > Properties > Product Properties > Create new property.
2. Create a property with label Billing Start Trigger and internal name billing_start_trigger.
3. Configure the picklist to include the following options as the label and internal value:

   ContractEffective

   ServiceActivation

   CustomerAcceptance

4. Save your entries.
5. Within the Zuora configuration, add the following code:

   {
   	"sourceObject": "LineItem",
   	"targetObject": "ChargeOverride",
   	"fields":
   	[
   		{
   			"source": "billing_start_trigger",
   			"target": "startDate/triggerEvent"
   		}
   	]
   } 

6. To activate the billing trigger, set the condition on the deal line item during the initial synchronization.

   Each product within a deal can have its unique trigger condition.