When a site is due for payment and the user pays for it through Paypal, the site doesn't reacti

When a site is due for payment and the user pays for it through Paypal, the site doesn't reactivate itself.

Do I have to Extend the membership of each site manually after I receive notification of payment?

I thought it was extending another month automatically?

If I have thousands of sites, it's going to become a huge task.

Right now I only have 15 sites because I'm testing it but I was about to release the entire platform to everyone.

Please let me know if this is just an issue I'm experiencing or if the plugin is designed for manual extention.

Thank you.