Decide at checkout option

Decide at Checkout :

Click on New Invoice and select the 'Decide at Checkout' option to create a decide at checkout invoice link as shown in the screenshot.
You can also choose a recurring or a one-time 'decide at checkout' invoice by enabling the toggles button as shown in the screenshot below. 'Allow Recurring' will ask the donor/client to select a recurring period at checkout(Monthly/Yearly).

At checkout, your client can put in an amount and select a period like one-time or recurring.
One-time: If they want to make full payment.
Monthly/Yearly: When they select monthly/yearly, the system will allow them to put the number of installments they want to pay on a monthly or yearly basis.