You have some malicious code in your plugin

I was really excited to try the shipping calculator plugin. However after installing and double checking everything I could see there is some code in your plugin that is hijacking the checkout process.

When I’m in cart view and click proceed to checkout a google payments window pops up. I do not accept google payments, and I’m never properly re-directed to checkout.

You need to seriously look into what’s going on here as this is either a hacked plugin, or you are deliberately hijacking the checkout process to take payments.

The window went away as soon as I de-activated the plugin, so it’s definitely your plugin doing it.

No one should install this plugin until this is resolved.