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CORS Issue

When making a post request to the sandbox url im getting 

Access to XMLHttpRequest at '' from origin 'http://localhost:62537' has been blocked by CORS policy: Request header field access-control-allow-origin is not allowed by Access-Control-Allow-Headers in preflight response.

Please help fix this i can use postman to create a transaction when i call within my app i get cors issues it seems sanbox CORS is not configured properly.


got it to work 

We have the same issue described above.

Can you please post the solution that you used to get it working?