My client paid me without logging into a PayPal account. How can they confirm the transaction?

[S_haha_n]

My client did this in spite of me strongly recommending they create a PayPal log in. Now they have created one using the email the invoice was sent to, but of course the transaction doesn't appear in their history. They've gone to the original link to view the invoice, but it just says it's been paid, and there's no button to confirm the transaction. 

Also, this was for a service, not for a product that was shipped. When I go to "update tracking information" I try to select "order processed" but I'm getting a "technical error" response from the website. 

Any suggestions on how to get this resolved? Or should I just refund the transaction and re-send the invoice to the client now that they have their PayPal set up?

[kernowlass]

@S_haha_n 

With payments received for tangible goods Paypal would request valid tracking information confirming the item has been delivered to the buyer. As they can validate the tracking information online, once it is delivered they can release the funds. As you have received the funds for a service no tracking number is applicable and Paypal would be unable to release these funds any sooner than the 21 days.

If you mark the transaction as processed then the buyer may have the option on their account to mark the transaction as delivery/satisfied. If the buyer confirms this by clicking on the "Confirm Receipt" button, the funds may be released to you sooner.  This is not always guaranteed or available. 
If not then sadly its 21 days.