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Dynamics 365 Community / Forums / Small and medium business | Business Central, N... / How to receive the cor...
Small and medium business | Business Central, N...
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How to receive the correct access token?

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Posted on by Reinert13 5

Im developing a React Expo app where im trying to access a BC page i've created.

Im able to get access to the page in Postman, but i'm unable to get access in my Expo app.

Here is my code:

    async function fetchToken(tenantId, clientId, clientSecret) {
        let token;

        try {
            const response = await fetch(`login.microsoftonline.com/${tenantId}/oauth2/token`, {
                method: "POST",
                headers: {
                    "Content-Type": "application/x-www-form-urlencoded",
                },
                body:
                    "grant_type=client_credentials" +
                    "&scope=">api.businesscentral.dynamics.com/.default" +
                    "&client_id=" + clientId + "&client_secret=" + clientSecret,
            });

            if (!response.ok) {
                throw new Error(`Failed to fetch token: ${response.statusText}`);
            }

            token = await response.json();
            console.log(token);
        } catch (error) {
            console.error(error);
        }

        return token;
    }

TLDR:

I get the wrong access token, can you help me get the correct one?
  • Reinert13 Profile Picture
    Reinert13 5 on at
    RE: How to receive the correct access token?

    I followed you video and got a successful response from Postman, but somehow I still can't get it to work in my app. Using https://jwt.io I can see that the access token from Postman gives access to my tenant, but the access token from my app gives me access to Microsoft Graph.

    This is the response I get in the terminal:

    <error xmlns="docs.oasis-open.org/.../code><message>The credentials provided are incorrect</message></error>

  • Nitin Verma Profile Picture
    Nitin Verma 21,091 Super User 2024 Season 1 on at
    RE: How to receive the correct access token?

    Have you added in Azure active directly in BC?

    Also please refer the below link for app registration in Azure.

    www.navwithnav.com/.../

  • Reinert13 Profile Picture
    Reinert13 5 on at
    RE: How to receive the correct access token?

    Do you mean like this?

    const response = await fetch(`login.microsoftonline.com/.../token`, {

                   method: "POST",

                   headers: {

                       "Content-Type": "application/x-www-form-urlencoded",

                   },

                   body:

                       "grant_type=client_credentials" +

                       "&client_id=xxxxxxxx-xxxxx-xxxx-xxxx-xxxxxxxxxxxx" +

                       "&scope=api.businesscentral.dynamics.com/.default" +

                       "&client_secret=xxxxx~xxxxxxxxxxxxxxxxxxxx~xxxxxxxxxxxxx"

               });

    Because that didn't change anything

  • Nitin Verma Profile Picture
    Nitin Verma 21,091 Super User 2024 Season 1 on at
    RE: How to receive the correct access token?

    Also Create an entry in Azure Active directory application page in BC and enabled with your custom app.

    Thanks.

  • Nitin Verma Profile Picture
    Nitin Verma 21,091 Super User 2024 Season 1 on at
    RE: How to receive the correct access token?

    Please use below syntax for your Body part

    grant_type=client_credentials

    &client_id=413ac35b-e0b6XXXXXXXXXXXXX-72f94d476bf8

    &scope=api.businesscentral.dynamics.com/.default

    &client_secret=9w38Q~PJoLaAsL.ObXXXXXXXXXXXLqIRpGAAb95blu

    header part

    Content-Type - application/x-www-form-urlencoded

  • Jeremy Vyska Profile Picture
    Jeremy Vyska 727 on at
    RE: How to receive the correct access token?

    Not sure if this guide will help, but it may relate?

    businesscentralgeek.com/how-to-use-postman-to-connect-with-business-central-apis

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