1) Go to "Quote" Tab. 

2) Select the quote you want to review. 

3) Upon selecting the quote, you will see the quote details page. 

4) On the right side box, you will see a "Payment" box. 

5) Click on "Request Payment".

6) A Pop Up box will appear. 

Note: Specify the amount you are requesting payment for. If you do not specify a minimum payment, the customer will need to pay the full amount. 

7) Click on "Request Payment". 

8) An email will be sent to the customer. See below: