I have paid for and installed the latest QDomain extension for Authorize.net payment. In following the instructions, I go to Users/Top Administrator and toggle on the authnetaim in both the access and modify user groups.
When I go into the extension, add my Authorize.Net merchant ID and transaction key, etc., then hit the Save button, the Save quickly forces a quit from OpenCart entirely. It is as though the Save is actually Exit or Quit. I go back into OpenCart and look again at the QDomain Authorize.net extension, and nothing is saved.