Link To Complete Payment?

Hi, 
I am setting up the scheduled task "Deposit Payment Reminder". But the Office staff is also asking me to create a link on the website where registrants can go to complete their payment. Is there a way to do that, or is the Email from the Scheduled Task the only way to get the link?

Addendum: Here is further clarification from the office staff. They are interested in a link, no automated emails.
"If we put a link on the APPLY tab for follow up payments, we need a way to tell them they need to put in what they are paying for (example: $250 balance on Fall show, $50 deposit for Holiday show). Otherwise, we get a chunk of money, and don’t know how to apply it across shows. So,

1.  we need specific instructions, and
2. they need a space to put a note with the payment. Is this do-able?"

Thanks!

If you want to have a link to allow users to access to make payment from there, try to create a menu item to link to Registration History menu item type

Users can login, then access to that menu item, see their registration history and complete payment....

Tuan

We don't have "User Registration Integration" or "Show User Login" enabled. Do we have to enable those? If so, can we somehow create logins for the registrants who already applied?