According to Immigration, Refugees and Citizenship Canada:

"Only some people can charge you a fee or receive any other type of payment. These people are called “authorized” representatives. They are:

• lawyers and paralegals who are members in good standing of a Canadian provincial or territorial law society

• notaries who are members in good standing of the Chambre des notaries du Québec and

• citizenship or immigration consultants who are members in good standing of the College of Immigration and Citizenship Consultants

We won’t deal with representatives who charge a fee but are not authorized. If you use an unauthorized representative, in Canada or abroad, we may return your application or refuse it."

 

Source: Immigration, Refugees and Citizenship Canada

https://www.canada.ca/en/immigration-refugees-citizenship/services/immigration-citizenship-representative/learn-about-representatives.html