As per your comment, you moved your site. The problem is that although you changed the outside configuration files, most likely internal settings saved in the database are NOT changed. Make sure that you STORE URL is correct(under SETTINGS). Also, I'm not sure what you setup for the modules (especially for payment). You will probably need to uninstall then re-install them in order correctly set them to the location change. In the future, it would help us to troubleshoot if you provided version and any possible errors you're seeing - Opencart does provide error logs as well (you can find them in the SYSTEM menu). I'm assuming you're using 1.54. Try that first and if you're still having problems, then please give us a little more detail in terms of error messages or a URL so that we can see the behavior.
If you have any further questions, please contact technical support or leave a comment at the bottom of the page.
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