You will need to use the process to perform orchestration and passing the temporary token alongwith to make object API call.
Here is what you should do.
1. Create a Service Connectors which provides 2 operations. and publish.
- Getting the bearer token
- Calling object API
2. Create an App Connection for this Service Connector and publish
3. Create a Process that uses this connection. First gets the bearer token (using Service step to bearer token operation) and then use it to make call to object API (using Service Step to object API operation)
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