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Dynamics 365 Community / Forums / Small and medium business | Business Central, N... / Grant Type password cr...
Small and medium business | Business Central, N...
Answered

Grant Type password credentials with Oauth ?

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Posted on by Valentine Motin 71

Hi everyone, 

I'm trying to call an API exposed by a partner, that seems to have a grant type for which I can't find any method in BC. 

In postman, the grant type that i'm using is "Password credentials" that uses both a username/password and an Id/secret, but i can't find any corresponding method in the Oauths codeunits. 

pastedimage1681227639658v1.png

Note that the "client credentials" method is simply unauthorized.

Is that even possible to do in BC ? 

I have the same question (0)
  • Gianfranco C. Profile Picture
    Gianfranco C. 370 on at
    RE: Grant Type password credentials with Oauth ?

    hello ,

    in postman, the variable "ClientID" and "ClientSecret" how are used? you can show the call log (obscuring sensitive data)

  • Suggested answer
    Nitin Verma Profile Picture
    Nitin Verma 21,696 Moderator on at
    RE: Grant Type password credentials with Oauth ?

    Hi,

    You try as per below parameters

    grant_type=client_credentials
    &client_id=144439fc-3c33-XXXXXXXXX4c28a23
    &scope=api.businesscentral.dynamics.com/.default
    &client_secret=nV38Q~oHl4hJ6eXXXXXXXXXXosdxZtLiMNaGx

  • Verified answer
    Gianfranco C. Profile Picture
    Gianfranco C. 370 on at
    RE: Grant Type password credentials with Oauth ?

    I believe you must first retrieve the access token, and then you must use it as the bearer authentication method in subsequent calls.
    Try this:

        procedure HttpRequest()
    var
        Token: Text;
        AuthString: Text;
        BearerLbl: Label 'Bearer %1', Locked = true;
    begin
        Token := GetToken();

        Headers := Client.DefaultRequestHeaders();
        AuthString := StrSubstNo(BearerLbl, Token);
        Headers.Add('Authorization', AuthString);

        RequestMessage.SetRequestUri(URL);
        // your code
        Client.Send(RequestMessage, ResponseMessage);

    end;

    procedure GetToken(): Text
    var
        UriBuilder: Codeunit Uri;
        Content: HttpContent;
        ContentHeaders: HttpHeaders;
        Request: HttpRequestMessage;
        Response: HttpResponseMessage;
        ResponseText: Text;
        Token: Text;
        ContentText: Text;
    begin
        ContentText := 'grant_type=client_credentials'  
                            '&client_id='   UriBuilder.EscapeDataString(ClientId)  
                            '&client_secret='   UriBuilder.EscapeDataString(ClientSecret)  
                            '&scope='   UriBuilder.EscapeDataString(Scope);

        Content.GetHeaders(ContentHeaders);
        ContentHeaders.Remove('Content-Type');
        ContentHeaders.Add('Content-Type', 'application/x-www-form-urlencoded');

        Request.Method := 'POST';
        Request.SetRequestUri(Url);
        Request.Content(Content);

        if Client.Send(Request, Response) then
            if Response.IsSuccessStatusCode() then
                if Response.Content.ReadAs(ResponseText) then
                    Token := ResponseText; //check responsetext; sometimes is a json with key access_token
    end;

    Don't forget to help the community by Verifying the answer and Like it if your question has been answered. It will let others know that the topic has verified answer.

    Thanks & Regards,
    Gian

  • Suggested answer
    YUN ZHU Profile Picture
    YUN ZHU 93,874 Super User 2025 Season 2 on at
    RE: Grant Type password credentials with Oauth ?

    Hi, just adding some info about Oauth, hope that gives you some hints.

    https://yzhums.com/20690/
    https://yzhums.com/33195/

    Thanks.

    ZHU

  • Valentine Motin Profile Picture
    Valentine Motin 71 on at
    RE: Grant Type password credentials with Oauth ?

    Hi Gian,

    This is what my request and response looks like in Postman when using password grant type

    pastedimage1681286880380v1.png

  • Valentine Motin Profile Picture
    Valentine Motin 71 on at
    RE: Grant Type password credentials with Oauth ?

    Solved ! I tried your suggestion and just changed it to : 


            ContentText := 'grant_type=password' +
                                        '&client_id=' + UriBuilder.EscapeDataString(ClientID) +
                                '&client_secret=' + UriBuilder.EscapeDataString(ClientSecret) +
                                '&username=' + UriBuilder.EscapeDataString(UserID) +
                                '&password=' + UriBuilder.EscapeDataString(UserPassword) +
                                '&scope=' + UriBuilder.EscapeDataString('all');
    It works ! Thank you so much for your answers
  • Gianfranco C. Profile Picture
    Gianfranco C. 370 on at
    RE: Grant Type password credentials with Oauth ?

    Glad to have been helpful :)

  • Amolm Profile Picture
    Amolm 19 on at
    Grant Type password credentials with Oauth ?
    Hi,

    I want to use the same "Grant-Type" as "password" in one of the application token generator.
     
    And I do see the code recommendation from Gian and Valentine.
     
    But I am not sure where and how this variable is used. 
     
    "ContentText".
     
     
    In Postman, I use this data in Request Body.
     
    Could someone help here?
  • Amolm Profile Picture
    Amolm 19 on at
    Grant Type password credentials with Oauth ?
    I think I got it..

    We have to write :
     
     ContentText := 'grant_type=password' +
                                        '&client_id=' + UriBuilder.EscapeDataString(ClientID) +
                                '&client_secret=' + UriBuilder.EscapeDataString(ClientSecret) +
                                '&username=' + UriBuilder.EscapeDataString(UserID) +
                                '&password=' + UriBuilder.EscapeDataString(UserPassword) +
                                '&scope=' + UriBuilder.EscapeDataString('all');

    Content.WriteFrom(ContentText);   //Aditional
     
    And rest all suggested by Gian
     
     
     

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