Payments in advance can be made by adding funds to your account credit balance. Payments for invoices (when due) will automatically be deducted from your account credit balance.
To add funds to your Dropals accounts credit balance:
Log into our client area: https://my.dropals.com/clientarea.php
Go to Billing --> Add Funds
Or if you are already logged in, simply click the following link:
https://my.dropals.com/clientarea.php?action=addfunds