How did you generate the auth token you are using? Merchant generated API tokens are not supported for Developer Pay API. You will need to generate an auth token via OAuth or the Clover Android SDK.
@ntlygens two questions,
Also, if you could provide your App ID (production and sandbox) that would be helpful.
Hi @ntlygens, I just tested on your sandbox merchant account, and the endpoint is working for me. Can you make sure you are using the correct endpoint and auth token:
https://apisandbox.dev.clover.com/v2/merchant/QG3TN01W93MJ6/pay/key
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