2.13Let's make it slightly more realistic

A developer probably wouldn't just blindly accept:

{
}

So we might add validation.

HTTP Listener
      ↓
Validation
      ↓
Set Variable
      ↓
Transform
      ↓
Salesforce Upsert

For example:

customerId required
companyName required

Conceptually:

if customerId missing
    → HTTP 400

if companyName missing
    → HTTP 400

We'll cover validation/error handling much more deeply later.