Error with getting token when executing API call

[satheesh_hai]

Tutorials: https://developers.sap.com/tutorials/cp-starter-isuite-api-management.html
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When following this tutorial, there is a 500 error when getting the auth token via the OAuth access policy. Testing the token endpoint with Postman, I receive

{ "error": "invalid_request", "error_description": "Missing grant type"

}

It is missing the grant_type=client_credentials payload in thegetoauthtoken step. I added the following to the <ServiceCallout>:

<Payload contentType="application/x-www-form-urlencoded">grant_type=client_credentials</Payload>

This eliminates the above error, but I still get a 500 error : An internal server error occured: The MPL ID for the failed message is : AGSQ1x3o51owaNCdcApVRyFI0reA

Any ideas?

[satheesh_hai]

Any solution to this problem ? Error Details com.google.common.util.concurrent.UncheckedExecutionException: java.lang.IllegalArgumentException: Status code:400; Reason:invalid grant type: , cause: java.lang.IllegalArgumentException: Status code:400; Reason:invalid grant type:

[arthurperry3]

com.sap.it.rt.adapter.http.api.exception.HttpResponseException: An internal server error occured: Failure converting a node of class javax.xml.transform.sax.SAXSource: org.xml.sax.SAXParseException; lineNumber: 1; columnNumber: 1; Content is not allowed in prolog.. Happening in the Content Modifier step.