The process for collecting payments from participants in a group session is exactly the same as for individual sessions. You need to collect the payment for each client individually by following these steps:
Navigate to Calendar iQ.

Find and select the Group Session appointment that you are wanting to collect a payment for.

Once there, you will see each client within the Group Session has its own designated Payment Icon. Select it for the Client you wish to process a payment for.

Once you select the Payment Icon, you will be brought to the Confirm Services and Fees screen.
Here you'll see the services added to the event, and you'll confirm what the client has to pay for the session, for example: Service Fee, Copay or Coinsurance.

Next, you will be brought to the Collect Payment screen. Input the following:
Whether or not you want to email the receipt to the client or request a remote signature is optional.
Select Submit to continue.

If paying with a credit card, you will be prompted to either enter credit card information OR; select a credit card on file to be processed.

Repeat these steps for each Client in the group session that you wish to collect a payment for.