For https://sandbox.dev.clover.com/invoicingcheckoutservice/v1/checkouts API URL where Can i get X-Clover-Merchant-Id and Authorization key.
For https://sandbox.dev.clover.com/invoicingcheckoutservice/v1/checkouts API URL where Can i get X-Clover-Merchant-Id and Authorization key.
X-Clover-Merchant-Id is your test merchant ID. The test merchant was generated when you created a developer account. The Authorization Key is your OAuth Token /accessToken to access, read, or write merchant data. This should be the first key you get back when going through OAuth 2 flow to give your app access to the merchant data.
I would suggest reading over https://docs.clover.com/docs/using-oauth-20 to get a good idea on how to make successful request.
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