A request must be 'accepted' by the Seller for a sale to be completed, the the seller will deliver the tickets as their listing explains.
Your card is authorized, confirming the card is active and valid, but will not post to your credit/debit card account. You will only be charged once a request is accepted by the seller. At that time the Seller will deliver the tickets by providing shipping/tracking, transferring the tickets to your associated account, or uploading the PDF into the message thread and the message thread will open up for the buyer and seller to further discuss and confirm delivery.
If your ticket is an electronic transfer, and has been transferred but is not showing up in your associated account, be sure to check your email to 'claim' the tickets, which should move the electronic tickets to your associated account. You may see this email in spam/junk folders, so be on the lookout!