The external payment will work through a bank transfer and it includes an administrative fee.
Start by Clicking on "Continue with external payment", see image below
At this point, you will be presented with the information/tools needed to do the bank payment.
In the blue area, you will find the bank information needed to do the payment.
Note: The information is specific to the registration you apply for, don't use the information in the image above.
Do the bank payment of the total amount listed here, include your name and the exam your applying for in the message information of the payment.
Upload the receipt for your payment under "Evidence of payment".
If you have additional information to the account approving the payment, you can add that under Message to the reviewer.
Submit your payment, by pressing the Submit button
Note: It will take a few days before the bank payment can be confirmed, so don't worry if it takes a week before the payment has been approved.