I need to integrate a back end application (i.e. without a GUI) with Magento 2 REST APIs. As such I believe I need to use OAuth for authentication. However, as it is a back end service, there will be no users to process any redirects to third party urls. Is it possible to authenticate via OAuth in Magento2 without going to a callback URL? I note when you register an integration the callbacks are optional, and if you leave them blank the access token and access token secret are generated. Many thanks.
PHP Script to demonstrate Oauth call with signature generation process. refer stackexchange link