So I had to chat (or call) to reissue a ticket tonight. There was a small add/collect. The agent sent me a link to enter payment details. It was a credit card form but did not support autofill (for cards or addresses). And every box was free form text - I wasn't sure whether to abbreviate or not. Super sketchy but i knew I had the real deal since I had called the United number saved in my phone and responded to the text they sent me. Very bizarre and time consuming. If it's secure, why not just text your info directly???