#OAS
https://swagger.io/docs/specification/describing-request-body/
以下のような感じ。
```yaml
paths:
/hoge:
post:
requestBody:
content:
application/x-www-form-urlencoded:
schema:
$ref: '#/components/schemas/AuthForm'
```
```yaml
components:
schemas:
AuthForm:
type: object
properties:
code:
type: string
required: true
example: "xxxxxxxx"
```