Hi @AndreaBarrantes ...
I'm not sure what you mean by "suspend subscription". The only thing I can think of related to subscriptions is discussion topics that you want to "subscribe" to within a Canvas course. Are you, by chance, wondering how to deactivate a particular user in a course? If that is the case, you can follow the steps in this Guide (but you may ultimately need to have your school's Canvas administrator help with this): How do I deactivate an enrollment in a course? - Instructure Community - 750 (canvaslms.com).
And actually, now that I look at the admin Guides, there is a Guide on how to suspend a user..not a subscription. How do I suspend or reactivate users in an account... - Instructure Community - 504141 (canvaslms.co.... Is this what you are trying to do (if you are a Canvas admin at your school)?
Please keep us posted...thanks!