Square Add-on Deprecation issue

I hope one of you with a cleverer brain than mine can help me resolve this. I have reached out to the developer of the addon without a response.

Please see the image attached.

There is a coding error I could do with help to resolve.

Also when I do go to checkout, it passes me through to Square correctly, however it does not pass through the shipping cost, but I presume that's related to the error, too.

Topic moved to specific addon. Maybe the addon author will spot this.

The in_geo_zone() function was changed in 2.5.x. The solution is provided in the deprecation notice text.

OK, I don't understand what it's asking me to do.

I have purchased the Paypal Add-On now someone has convinced me that it would work with 2.5.5

Replace the "If not in geo zone" part with this for 2.5+:

        if ($this->settings['geo_zone_id'] && !reference::country($customer['country_code'])->in_geo_zone($this->settings['geo_zone_id'], $customer)) {
          return;
        }```