HTTP Request get Access Token for OAuth2

I am using a “HTTP Request” Activity to POST to a Sharepoint URL with this Endpoint:

https://URL1/_api/web/GetFolderByServerRelativeUrl(‘URL2’)/files/add(overwrite=true,url=‘URL3’)

As a response I get an Error 403

<m:error xmlns:m=“http://schemas.microsoft.com/ado/2007/08/dataservices/metadata”>
<m:code>-2130575251, Microsoft.SharePoint.SPException</m:code>
<m:message xml:lang=“en-US”>The security validation for this page is invalid and might be corrupted. Please use your web browser’s Back button to try your operation again.</m:message>
</m:error>

I just don’t understand how to get the OAuth2 Access Token to validate my POST.

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Hello MaurerDa,
In these videos, I do Oauth2 with multiple systems and you can see how I use the Keys that I received from servers:



Thanks,
Cristian Negulescu