Ko-fi doesn't handle any money that is sent. The payment is made from your supporter, directly to the creator, through the PayPal platform. Often payments go into a 'Pending' state in PayPal.
Sometimes when one of the PayPal accounts are new, it can take a few days to complete.
When PayPal completes the payment, the support and message will show up in Ko-fi.
The most common reason a payment is in 'Pending' is that the creator's email needs confirming on the PayPal website.
The second most common reason a payment is in 'Pending' is that the wrong PayPal email was given by the creator.
In either case, PayPal will normally keep trying for up to 30 days, after which the payment will be returned to the sender.