Unfortunately this varies depending on the customer. Generally the `acct_number_internal` sent by HQ with the request will have the account in a format the FI is comfortable with displaying to the end user. It could be either masked or unmasked. If you need the full account number there are `acct_number_internal_unmasked` and `acct_number_external_unmasked`. A HADE with the name "AccountNumber" is rare.

The account number setup varies depending on the customer. Generally the `acct_number_internal` sent by HQ with the request will have the account in a format the FI is comfortable with displaying to the end user. It could be either masked or unmasked. If you need the full account number there are `acct_number_internal_unmasked` and `acct_number_external_unmasked`. A HADE with the name "AccountNumber" is rare.