Messages from stay

"Stay" appears to be a service or company that sends SMS messages with verification codes. The examples of the SMS messages indicate that they are providing some sort of two-factor authentication for an app, website, or other online account. There is no clear indication from the web search results what specific type of service "Stay" provides beyond this basic function. However, it seems likely that their primary focus is on security and identity verification for digital accounts based on these clues.