You can choose to send certificates to customers at two points:
Point of purchase: The customer will be emailed their certificate as soon as they've completed the checkout
Point of Fulfilment: Certificates issued when order is marked as fulfilled. Choose this option if your order cancellation rate is high.
How can I set my preferred option?
Go to the Verisart app
Go to the settings tab
Scroll down to "Set certificate trigger" and select your preferred option