What is the PayPal link or address for making my monthly payment?
Here is article describing how to update/make a payment on your Keap account:
https://help.keap.com/help/update-your-billing-information-make-a-payment-on-your-account
Or, if you have Infusionsoft:
https://help.infusionsoft.com/help/update-your-billing-information-and-make-a-payment