Hello, I'm trying to create a js function using fetch to refresh my access_token but it doesn't work. Every time I get the below error: Access to fetch at 'https://idfed.constantcontact.com/as/token.oauth2' from origin 'myUrl' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled. I'm guessing this works on the backend only?? Please advise! Thanks,
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