Unexpected identifier "CONFIG_NAME"

Probably removing the string from the const is the safest fix. Feel free to open a PR.

I've tried opening a PR, but I am not able to push my changes to the branch, even though drupal.org says I have push access. Adding a patch for now.

Looks like in the MR, you removed const instead of string

Confirmed, MR resolves recently introduced fatal error when using this module on PHP 8.1. Appreciate the patch!

Thanks for the fixes here.