The United Arab Emirates (UAE) tax authorities have published a Payment User Guide on their website. The guide covers the four methods of paying Value Added Tax (VAT) and Excise Tax via:
It provides step-by-step instructions of how to pay by each option, including diagrams and useful tips. It is also important to note that there are some restrictions to using the latter two methods, not least of which is the requirement to use one of the authorized banks.
It is important to be aware that payment of tax by way of credit card will incur a handling fee of 2-3% of the total payment amount. Using the Giban options also incurs a small fee.