For ticket events, if you are selling items during the event, you can add those sale items to the event. In this case, you can charge for the items you sell via Instateam app during the event. For example, if you are selling t-shirts at the event, the member can buy the t-shirt from you and pay via credit card. You can enter their credit card number and process the payment.
To add sale items, you can click on the ticket event. In the event detail screen, you can click on Options button and then select Manage Sale Items. You can now enter the name of the item and the price for the item.