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Thank you for reaching out, @Ibf! One of our agents will get back to you with more information as soon as possible. -Jenn
Thanks for contacting Visa Developer Support. The IAT/ICA number is not related to the Visa Developer Portal. Please contact your issuing bank to get the IAT/ICA number.
To what I know, the IAT number is assigned to the billing entity. Let’s say if you have to wire the money into someone’s account, the billing company should give you the information like Account number and IAT number. I can’t be very sure on this but usually this is what I have seen.