Developer for online training business

I’m building an online training business, where I will be selling online courses as both single sessions and in packages. My target audience is SMEs/self-employed or individuals planning on starting a business.

I have a wix website but am looking for someone to set up an online training portal/system that generates a customer login, where they input their payment details and have access to the purchased training sessions for 30 days.

I don’t know if it’s possible to build it into my website, or whether it will need to be hosted externally (but linked to from my website).

I obviously want to avoid the customer sharing these login details with people outside their business, but am unsure of the logistics of this.

I will also need someone to talk me through how to upload videos in the future.