Custom Data Object REST service throws "HTTP/1.1 403 Forbidden" Error

Summary

What privilege is required to execute a REST service call to a custom data object?

Content

Hello everyone,

I created a custom data object. Now I am trying to get data into it using a REST call. Here is a sample URL:

https://somewhere.oraclecloud.com:443/crmCommonApi/resources/latest/Custom_Object_c

Any operation gets me a 403 - Forbidden HTTP response.

Since I created the object, I have full rights to it in the UI.

I looked at the following Document. But it doesn't tell me what privilege is required to execute a REST call on a custom object.