Im not sure if the API page is the right place to put this but it seems the terminal device has an issue with the test print button inside the terminals OS.
On the Square Terminal, if you go into >Settings >Hardware >Printer, then click the ‘Print test’ button. Nothing happens. This feature used to work on previous OS versions
Im currently on
OS version: 5.45.0087
App Version: 6.38
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Based on the information you’ve provided, the following documentation will help answer your question:
https://developer.squareup.com/docs/app-marketplace/requirements/terminal-api
https://developer.squareup.com/docs/square-get-started
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https://developer.squareup.com/docs/devtools/sandbox/testing
https://developer.squareup.com/docs/get-started
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Since this is in the Square app on the Terminal device and not the Terminal API have you reached out to our Customer Success team? Also what troubleshooting have you done? 