Hi Guys.   Thanks for all informations, i really appreciate it. Indeed, i am in the same position.   I need to connect with a proc http to return Access Token via REST API...   With Potstman, i get the acess token without problem :   Method : POST URL : "https://services-xxxxxxxxxxxxxx/token" Passing information in the body :  client_id=XXXX; client_secret = XXXX; Grant_type = client_credentials   Headers : Content-Type = application/x-www-form-urlencoded   Authorisation : Type = OAUTH 2.0 Request Header.   In SAS, i met some difficulties. I tried to use the code mentioned above.  Unfornutally, i have a bad request with a invalid_client resp.    filename resptkn temp; filename headers temp;   proc http method="POST" url="https://services-xxxxxxxxxxxxxx/token" ct="application/x-www-form-urlencoded" in='client_id=XXXX&client_secret=XXXX&grant_type=client_credentials' headerout=headers out=resptkn HEADEROUT_OVERWRITE ; run;     >>> {"error":"invalid_client"}   I used this proc to connect SAS with GA api or salesforce and i didnt' met issu.. Do you have an idea ?   Thanks in advance for your help.       ... View more