The certificate is online https://familysearch.org/
If you are new to this site, you'll have to logon and setup a "free" user account to access/print. Lizzie Hammer(s) is a mystery. There were other Hammer(s) in Fannin and Hunt Counties but I did not find her as a single lady. Also did not find her in Tennessee. Beginning to think Hammer(s) was her surname from a prior marriage? Too, Wyley's brother Monroe Jackson Perry relocated to Texas. W. P. Perry wed Lizzie Hammers, 11 Oct 1887 in Fannin County. That's the same place his brother Monroe died 16 Jun 1938.