Multimeter API: Use Raw JSON Text in the Body

Multimeter can send JSON from a raw text block when you need exact control over the payload. The `|-` block keeps the nested JSON body as text instead of converting it from YAML fields. The video tests that the raw JSON payload is sent correctly.

```yaml
type: api
url: https://test.mmt.dev/echo
method: post
format: json
body: |-
{
"envelop": {
"header": {
"application": "multimeter"
},
"body": {
"username": "mehrdad",
"password": 123456
}
}
}
```

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Видео Multimeter API: Use Raw JSON Text in the Body канала Multimeter