We need this for our business, too.  To be honest, I am astonished that QBO does not have the option to add a payment link to customer statements, especially so inasmuch as that feature is available when the initial invoice is sent.  Our follow up customer statements assess a late fee so that the amount due from the customer increases to a different amount from the original overdue invoice.  We would absolutely love to have a payment link added to customer statements.  Please QBO get this done ASAP!