Scope depends on the applicant's citizenship and route. A Canadian citizen and a Mexican citizen do not face the same sequence, since Mexican citizens generally need a visa while Canadian citizens are generally visa exempt for TN admission. The invoice should name the steps that actually apply.
Let the route define the line items
Ask the professional to write out the sequence for this specific applicant: evidence gathering, the employer's support letter, any petition, any consular step, and the admission itself. Each stage carries its own work and its own charges. A quote that lists only generic TN processing cannot be checked. Petition approval, visa issuance, and admission at inspection are distinct events, and the invoice should show which of them it covers.
The classification turns on citizenship, a qualifying listed profession with its precise credential requirements, prearranged professional employment, and temporary entry. Ask whether the transcript or registrar’s letter actually confirms the awarded credential, field and conferral date. Under the diploma-or-certificate route, both the qualifying credential and three years of experience matter. The first review should produce a yes, no, or unresolved entry for citizenship, the role, the qualification, and the employer relationship.
Where more than one entry could plausibly apply, take advice on which one the actual duties support rather than choosing the one with the easier rule.