How to get Intermediary bank account details from supplier on supplier external registration URL

Summary:

Currently there are no provision to get Intermediary bank account details from supplier on supplier external registration URL, only when a supplier is created internal user/supplier administrator can manually go into the supplier and add intermediate account details however how are we supposed to get those details from supplier at the time of registration?

This looks like a common requirement, to get bank details along with intermediate account details from the supplier side. Could you please help us with what are industry best practices in such case?

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