If I pay what I owe on my credit card do I get available credit back?

lets say I have a 300 dollar credit limit and I max out 300 dollars ok so lets say I pay them 300 dollars back do I automatically have my 300 dollar credit limit back? or how long do I have to wait before I can use my credit card?|||Yes, you have your $300 limit back as soon as the payment is posted to your account.|||Yes, you get the credit limit back as well as help improve your credit score.|||yes as soon as they receive and process your payment it will post to your account and bring your avail credit back up.