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I am trying to exchange an Access token for an refresh token . I am sending client ID , secrete , grant type , scope in headers , URL query parameter and posting as Json over body , but I am receiving invalid client as response . Can you please me know how to exchange an refresh token for an access token . also please let me know if i have to make any changes in thinktecture OAuth server to enable this .

POSTMAN screen grab

Naveen Rayappa
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The Content-Type of your request is "application/json", but the specification (RFC 6749) requires that the Content-Type of token requests be "application/x-www-form-urlencoded".

Takahiko Kawasaki
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