Bill Pay - Payment Processing

How can I stop a scheduled payment?

How do I know if a payment has been sent?

How far in advance can I schedule a payment?

How is the payment sent to my Payee/Biller?

How many days does it take for my payment to reach the Payee/Biller?

What about payments I make every month for the same amount?

What do I do if my Payee/Biller never received my payment?

What do I do with the part of the invoice or bill that I usually mail back to the Payee/Biller with my payment? Doesn't the vendor need that to process my payment?

When is the money for my payments taken out of my account?

Without a check stub or a canceled check, how can I prove that I made a payment?