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docs(sms): note E.164 recipient requirement for SMS sends #21

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tuyakhov merged 1 commit into from
Aug 6, 2026
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docs(sms): note E.164 recipient requirement for SMS sends #21

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3 changes: 3 additions & 0 deletions README.md
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Expand Up @@ -158,6 +158,9 @@ sk.send_raw(subscription_json, WebPushContent(title="Back in stock", body="Tap t
click_url="https://example.com/item"))
```

SMS recipients must be an [E.164](https://en.wikipedia.org/wiki/E.164) phone number
(e.g. `+15555550123`); a non-E.164 `to` is rejected with `400 invalid_recipient`.

### Batch

Sends many messages concurrently (a thread pool for sync, `asyncio` for async). A failed
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