Keep getting this error: Square error: this header value for Authorization is not correct null. I’m also unclear where to get Script URL (headers) field. I’ve tried the entries in the demo app, but that does not seem to be working. All other set up information seems to be correct.
Hello @xan.hong,
Thank you for reaching out to us, and my apologies for the delayed response 
The error you’re encountering could be related to incorrect plugin settings. To resolve this issue, please ensure that you have inserted the correct API keys and configuration settings into the plugin. If you’re still facing the problem, it would be helpful if you could provide us with screenshots that show how you have set up the plugin and the configuration of the actions you are trying to perform. This will allow us to better understand the issue and provide you with more specific assistance.
Regarding the Script URL for the live version, it should be either web.squarecdn.com or web.squarecdn.com/v1/square.js. You can try both of these URLs and let us know which one works for you. This information is based on Square’s documentation taken from here.
Looking forward to your response 