Check various fields for duplicates

When infusionsoft checks for a duplicate for default checks email and has the possibility of checking for name last name and company.

how can I make it to check also the field of Id document? how can I make that call if the webform submitted send the info through and API integration?

The only way to check for id specifically is to do a query based upon the criteria but that is duplicating the same thing with the existing dup check. It would essentially be what you’re already doing, only twice.