While I don't use the meta refresh, one option can be creating a simple php (or html) page outside of wordpress (thanks.php / thanks.html) and inserting the meta tag there.
In addition, I would no index that page.
While I don't use the meta refresh, one option can be creating a simple php (or html) page outside of wordpress (thanks.php / thanks.html) and inserting the meta tag there.
In addition, I would no index that page.