Start Subscription has 3 choices.\
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**Immediately**: This will trigger the subscription to start automatically and create a sales order and delivery order (if shipping a deliverable product) immediately. This will also cause the first subscription period to be invoiced and billed as well. For example, you set the subscription to "Immediately" and you have a registration fee of $1.00 and the first in the subscription is Widget 1, the customer would be charged $1.00 and the subscription would immediately start. They would then be charged for Widget 1 and a shipping order would be created (if the product was shipping). *Please note that this is not a common use case. Also note, if you use the subscription start on "Set Date" feature and the date has passed, it will default to "Immediately".*
**First Billing Delay(Previously "After Trial of"):** You will typically set this to match the subscription timing. After the customer buys the trigger product when do you want the subscription to start? This sets up a "trial" period meaning that they will pay for the subscription at the time of the sale, but will wait for a specified time period for the subscription to start renewing. For example: I am selling a supplement subscription that renews every two weeks. When I a customer buys the trigger product the first auto-billing will occur two weeks later and continue until the customer edits/cancels the subscription.
**Set Date:** This option will start the subscription on a set date for all users. If you allow the product to be sold after the "Set Date" the subscription will default to start immediately. Note\* this could cause the customer to be billed two times in a short period. They will need to be aware of that. ***Please note*\*** If there is a defined timeframe for the subscription (ie 12 months) and a customer signs up for the subscription *after* the Set Date the subscription will run for 12 months. If you want it to end with the other subscriptions you will need to manually adjust the individual subscription. \*See the documentation for editing individual subscriptions. ***Also Note -*** *If you set the date for 9/1/2023 and the customer purchases the subscription after the set date, the default setting will be "immediately."*