When completing an import from Groupcall (via the API) the following prioritisation rules are applied for each person type uploaded:
Student
- FirstName = Forename, LegalForename
- LastName = Surname, LegalSurname
Staff
- FirstName = Forename, LegalForename
- LastName = Surname, LegalSurname
i.e.
Name in ParentPay after import = [Use this field if populated], [Use this field as the fallback option]