x-postman-request
`x-postman-request` appears on operations. Its value is a string. Used by 3 providers across 4 OpenAPI documents. It sits in the `x-postman-` namespace, so its meaning is defined by postman tooling rather than by OpenAPI. Observed values include `{{base_url}}/compliance/api/v3/companies/{{company_reference}}/users/{{user_id}}`, `{{base_url}}/compliance/api/v3/companies/{{company_reference}}`, `https://finditparts.com/api/v1/reseller_customer_sessions/:reseller_customer_ses`, `https://finditparts.com/api/v1/sessions`. Consistent with data & schema semantics — this is inferred from where the key appears and what it carries, not from any published definition.
Where it appears
| Location in the document | Occurrences | |
|---|---|---|
| operation | 99 |
What its value looks like
| Value shape | Occurrences |
|---|---|
| string | 99 |
Observed values
Sampled from the specifications, most frequent first.
Providers publishing it
All 3.
Why this is not in OpenAPI
Extensions exist because a provider needed something the specification would not carry. Most of what they hold is not the API contract at all — it is operational metadata about the contract: documentation, lifecycle, policy, provenance, and now agents. That metadata is usually better placed alongside the contract, in an Overlay or an APIs.json index, than crammed inside it. See everything else doing the data & schema semantics job.