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403 Unauthorized


I was trying to make a call to the following API: “”. Its POST Call. I was using this documentation for the reference : “”.
I have set all the required headers(APIKey,Content-Type,Accept,Authorization). and supplied required Json in Body.
I got this error : "{
“message”: "Sandboxes are required for partners or customers looking to use Concur’s APIs to read and write data from Concur. It is important that you contact your assigned technical resource at Concur to gain access to a sandbox that best fits your scenario. "
and Status as “403 Unauthorized” .
Can any body help me to get authorization or refer me to some documentation?
Thanks and Regards
Maninder Singh