3.36Salesforce relationship fields

This becomes important.

Suppose Salesforce Contact needs:

AccountId

You've already seen:

{
    AccountId: vars.accountId
}

But Salesforce can also support relationship/external ID techniques in various API scenarios.

At the interview level, the key concept is:

Parent records frequently need to be resolved before child records unless you're deliberately using Salesforce external-ID relationship capabilities or composite operations.

So don't automatically write:

Account
Contact
Opportunity
Case

all independently.

Relationships matter.