Try following this video step by step (the video accidentally skips the permission setting step so don't forget to that), and let me know if you can get it to work: https://www.youtube.com/watch?v=6riNP_wlKcU
There's additional troubleshooting steps you can find on our developer blog: https://medium.com/clover-platform-blog/troubleshooting-common-clover-rest-api-error-codes-9aaa8885373
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