re: "I thought that a payment would be made when I ended a contract."
Not necessarily.
re: "My billing section says that there is a zero balance. The freelancer's account shows I still owe $100."
That is not necessarily true.
re: "No money has been charged to me. How do I make a payment on a closed contract?"
A couple of things:
How do you make a payment on a closed contract?
That is easy.
When you close a contract, you STILL have the ability to make a payment.
You navigate to the contract, click on the Three Dots icon, and select the option to "Send bonus."
You can make a payment in any amount.
But there is a DIFFERENT question:
SHOULD you make a payment?
Probably NOT.
If this is an hourly contract, then your credit card is charged NEXT week. Your credit card is NOT CHARGED when a contract is closed.
https://support.upwork.com/hc/en-us/articles/211063698-Weekly-Billing-Cycle
So if a freelancer was working for you using an hourly contract, then you should NOT make a payment now. Your credit card will be charged AUTOMATICALLY in due time.
If this is a fixed-price contract, then your credit card was ALREADY CHARGED when you funded the escrow payment. You don't need to pay AGAIN. If you closed a contract, then you already RELEASED the escrow payment to the freelancer. The freelancer will receive the money in due time. There is a 5-day security period.
YOUR client-side user interface shows all of this information. That is where you should look for payment history. If the freelancer says she hasn't been paid, don't worry about it. Or tell her she can come to community.upwork.com to ask questions. Sometimes newbie freelancers don't understand where to look, although it's really not complicated on the freelancer's side.
