If your operator entered a Driver collection notice of payment, it appears as the first field in the details of the booking, as you see in the picture below.
At the moment of the collection select the payment method and click on Collect.
If your operator configured Stripe, you can have your customer pay directly with a credit card!
Click on Stripe and make your customer enter the card details and if he wants, an Email for the receipt. Click on Pay to finish the operation.