How to select the created custom field when generating an invoice for payment?

Question

1C-Bitrix

Good afternoon.
Faced such a problem: I created an additional field in the "User fields" section for the USER object. In it I store the TIN of the payer's company. Now I want this TIN from this field to be substituted in the invoice for payment. I create a payment system "Account (bill)". In the "PS handler settings" section, opposite the "TIN of the customer company", I select "user", but the drop-down list contains only fields that are created by default in Bitrix for users.
Can you please tell me how to pick up my field?

Answer 1

Did it in a roundabout way.
Created the TIN order property. Hung a handler on the OnSaleComponentOrderOneStepComplete event .
In this handler, I substitute the data from the custom field into the order property.
And in the account settings I select the TIN order property.