Square Payment Module for Zen Cart [Support Thread]

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Yes I did make sure production is selected. I also now selected the correct API version.

I believe it now got it working, by first entering the Sandbox credentials in Zencart, then update, then replace the Sandbox credentials with Production credentials.

The credit card option displays on my checkout_one page, but I guess it isn't supposed to look like this(?):

Are you testing this on an HTTPS server? (Even in sandbox, you need to run it through HTTPS or it will not work.)