The IAT number is not directly related to the Visa Developer Portal, therefore, I will not be able to comment directly on how you will get the IAT number. Please send an email to firstname.lastname@example.org and someone will provide you with assistance.
so it’s critical that your financial institution stays up-to-date on secure and efficient IAT processing. Over the past few years, NACHA has updated the NACHA Operating Rules to reflect the increasing number of cross-border transfers. We’ve incorporated information on all parties to the transaction in the international payment format, required foreign payments to be classified with the IAT designation, and clarified how IATs with split transactions should be handled. Notepad++ Malwarebytes FileZilla
Please contact your issuing bank to get the IAT/ICA number.