The registration fee for sitting ISAT is US$320.
Payment is made to Prometric at the time of registration.
Payment of fees
Payment must be made by credit card. Prometric uses a secure carrier for its online payment functions to act as its interface with the banking system. Credit card and accompanying personal details are not recorded or stored by Prometric but are encrypted at point of capture and transmitted directly to the bank.
If you do not have access to a credit card, you should consider purchase of a pre-paid credit card to use for online transactions.