If you have an outstanding balance to pay back your credit card company, the company has the legal right to sue you. You should always show up in the hearing. Moreover you need to ensure that you have a solid defense to convince the judge that you have genuine reason for which you are unable to pay back your credit amount. Otherwise the judge or jury will grant the judgment to your credit card company.
Each state has its own different law as far as the rights (court judgment granted) of the creditor are concerned. In Florida the creditors are granted many additional collection rights following a winning Florida Credit Card Lawsuit.
A credit card company can levy you bank account by applying for an injunction of garnishment and by serving the court granted garnishment order to your bank. In that case your bank can freeze your account. The bank will then withdraw the amount you have as loan from the creditor and send the amount to your credit card company.
Your creditor may also be granted the right for wage garnishment. In that case your employer will send a certain percentage of your paycheck to the creditor.
The credit card company you owe the loan can also set a property lien against the properties you have such as your home, your vehicle, your land etc. You can not sell the property until you pay off the credit amount. If you do not succeed to pay back the credit amount, the creditor can grab your property.