With this features in SKYHOSTING.ME, you can upgrade or downgrade the products and packages from the client area. When you place an upgrade or downgrade order, they will be refunded what they haven't used of the current cycle on the existing product/service and then charged for the remainder of the cycle at the new product/services price. The next due date doesn't change.
Price Per Day * Number of days until next due date = Amount Credited
Price Per Day * Number of days until next due date = Amount Debited
Total Payable Today = Amount Debited - Amount Credited