How do I monetize my registration system?

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Java

PHP

PayPal

registers

payment

Hello everyone!

I have recently installed UserCakes registration/user system on my website.

I want to make it so that registration is available only to users that pay a monthly fee.

Does anyone have any advice on how I would go about doing this or where I could get some information? I'm new to coding and would really appreciate any help or advice.

Also, if anyone knows good places to search for freelancers that would do this type of work for a price, I would be more than interested.

Thank you!