Messenger.com has an SSL certificate but this does not guarantee that Messenger.com is a legitimate website.
You should always check before doing any online payment that the website has a SSL certificate (padlock shown in the address bar).
Domain trust report for Messenger.com:
Messenger.com was first registered 24 years 328 days ago.
Messenger.com has some age to the domain name which is a good sign.
Domain age: Few years old