Hi again.  After I create an invoice for a new customer for this first time, I click the 'create recurring invoice' link at the bottom centre of the invoice creation screen.  That takes me to a page that is the recurring invoice creation page.  This recurring invoice creation page displays the radio button for ''Let customer make payment". 

Q1. What is the purpose of this button?

Q2. Does not clicking it mean that a customer won't be able pay the invoice??

I have never clicked this radio button on any of my recurring invoices when creating them.  But my customers have been able to make payments to me.  

Q3.  How are customers able to pay me when I haven't been selecting this radio  button previously?

Q4. How does clicking this radio button affect if my customers will be able to pay via online payment method or bank transfer?  

Sorry, I'm really confused - but appreciate your help!