Yes, it is!
Go to settings and enable the payment options and fill in your PayPal info
Create your form
Have a 'Radio Button' field for the Yes-No
Have a 'Number' field for the payment amount
Select the 'Number' field and then select options tab
On the Payments option select 'Price Input'
On the options tab scroll down to 'Show Element' and select 'Using Display Rule'
Select the form element 'Radio Button'
Select the Operator as 'is'
Select the value as 'Yes'
Click the icon next to 'insert'
When you preview your form now, you should see everything except the payment option. When you select 'Yes' on the radio button then the payment line should display.
Hope this helps.
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