How to implement registration for Junior levels of users for my project

I'm developing an ecommerce related project in Django rest framework. In my project, there are three types of users, primary user, junior level user and clients. i will keep the registration open for primary users and the next level (junior level and clients) users should only be registered by primary users. primary user will create the credentials and send the invite for next level of users. I've no proper ideas for this. can anyone suggest some good ideas for this ?

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