# Postman automated oAuth2 Client Credentials via Pre-request Script

**URL:** <https://forum.mautic.org/t/postman-automated-oauth2-client-credentials-via-pre-request-script/25192>\
**Category:** General Discussion\
**Created:** [August 26, 2022, 10:50am UTC](https://forum.mautic.org/t/postman-automated-oauth2-client-credentials-via-pre-request-script/25192 "2022-08-26T10:50:08Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![stgoos](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.mautic.org/stgoos/32/8149_2.png) [@stgoos](https://forum.mautic.org/u/stgoos)\
**Post date:** [August 26, 2022, 10:50am UTC](https://forum.mautic.org/t/postman-automated-oauth2-client-credentials-via-pre-request-script/25192/1 "2022-08-26T10:50:08Z")

</div>

At work I’m working on an API integration with Mautic and for quick API call testing I use, like many, Postman (the desktop app version). With the below steps you can automate the oAuth2 Client Credentials.

**Step 1: Setup an Environment for Mautic**

In this Mautic environment, create the following 3 variables:

- base\_url
- oauth2\_client\_id
- oauth2\_client\_secret

Populate them with the values. Be aware that the {{base\_url}} is the URL of your Mautic installation without a trailing slash (/) or /api/ at the end.

For the client ID and secret, go to Mautic \> Settings \> API Credentials.  
Create a set of client keys if you haven’t done so yet.

**Step 2: Select the Environment**

Select the Mautic environment you just created in the dropdown at the top right corner of the app.

**Step 3: Open the collection \> Authorization tab**

Now go to the Authorization tab of your collection and:

- Set the **Type** to **Bearer Token**.
- Add **{{mautic\_bearer\_token}}** as the value for **Token**.

**Step 4: Open the collection \> Pre-request Script tab**

Copy the below code and paste it the tab.

```auto
// oAuth2, Client Credentials, no user impersonation so no manual login required
// source: https://forum.mautic.org/t/postman-automated-oauth2-client-credentials-via-pre-request-script/25192
// author: stgoos
// tested with: Mautic 4.4.x
pm.sendRequest({ 
    url: pm.environment.get("base_url") + "/oauth/v2/token",
    method: 'POST',
    header: {
        'Accept': 'application/json',
        'Content-Type': 'application/x-www-form-urlencoded'
    },
    body: {
        mode: 'urlencoded',
        urlencoded: [
            {key: 'client_id', value: pm.environment.get("oauth2_client_id")},
            {key: 'client_secret', value: pm.environment.get("oauth2_client_secret")},
            {key: 'grant_type', value: 'client_credentials'}
        ]
    }
},
    (err, res) => {
        pm.globals.set("mautic_bearer_token", res.json().access_token)
        // or use pm.environment.set() instead when you want to store the token in the active environment
        // console.log(res.json());
});

```

**Step 5: you’re (almost) done**

Well, basically you’re done, just don’t forget to set the Authorization **Type** of your requests to **Inherit auth from parent** (if it wasn’t set to that already).

Enjoy your automated collection and apply of the Bearer token with every request.