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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