I have followed the steps from https://community.clover.com/questions/27944/unable-to-get-access-token-for-sandbox.html to get the access token for one of our pre-production environment.
I connected this app to my test merchant:
Merchant ID: QBYCW4NYYD931
However I am getting the CORS error when attempting a connection with Clover Flex.
Can you please help me in understanding what I am doing wrong in getting the access token?