Hi @Tim,
Thank you for your inquiry. The IAT/ICA 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/ICA number. Please contact your payee for the significance of IAT/ICA.
If you would like further assistance, please email developer@visa.com and someone will find a representative that will help you with your inquiry.
Thanks,
Diana
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