...
You can use the values of Client ID and Client Secret to gain access to the Coupa APIs. When you create a new Open Connect client, access is granted to a specific application or user client for specific areas of the product, defined by scopes.
Requesting an Access Token to use in Coupa Dynamic OAuth2 account
Once you have created a client, the next step is to request for an access token. Token is automatically accepted and generated. Client credentials requires no consent and a HTTPS POST request can be made directly to Coupa.
...