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Hi all,
I have noticed that this plugin is not compatible with PHP8.0. As it appears this is no longer maintained, I have fixed the file that is causing the issue.
Replace this file in invisible-recaptcha/includes/utils/MchIPUtils.php
With this:
https://gist.github.com/digitalchild/23a0e43f6ada6222b4f57d53e0d32477
Cheers,
Jamie
PS. No affiliation with this plugin. I am a user of the product and want to continue using it.