According to this documentation, you need to know the external ID field of an object to inset new records. For some of my custom objects, I'm not seeing any fields in the object description that have an
externalId value of true (I'm logged in as an admin).
How do I insert a new record of an object that does't have an external ID field?
Note: I don't have much control over the current object structure
Using REST API v31.0