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SMS in Senderz is platform-managed: you send through Senderz’s own Israeli carrier accounts (019 primary, CommPeak failover) and the credit wallet pays the carrier. You don’t plug in your own carrier API.

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The SMS credit wallet

Every tenant SMS — campaign, flow, test or transactional — is authorised against your SMS credit wallet before it reaches a carrier. This is a hard, non-negotiable gate.

Top up

Buy credit packs (500, 2,500, 10,000, 50,000). The balance is the source of truth; the transaction log is append-only.

Never negative

The wallet refuses to go negative under any race. A hold is placed at authorise time and settled on carrier acknowledgement.

Auto-refund

On hard provider failure (rejected, invalid number, blacklist) the hold is refunded. Holds expire automatically after 5 minutes if a worker crashes.

Segment counting

1 GSM segment = 160 chars, 1 Unicode segment = 67 chars. The wallet and the send worker count with the same library.
The only exception is platform-paid auth OTP (2FA login codes), which Senderz covers. Every merchant-billed SMS goes through the wallet.

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Sender IDs

The From name on an SMS is a Sender ID. Because every tenant shares one carrier account, sender IDs are gated to prevent impersonation.
1

Use the platform pool

SENDER, INFO and SHOP are pre-registered and available to everyone with no request.
2

Request a branded ID

Request your brand as a sender ID (3–11 chars, A-Za-z0-9-). Clean names auto-approve instantly; names that look like a bank, government body, carrier or another tenant’s active ID are held for operator review.
3

Send from it

Once active, pick it in the SMS composer. An unapproved branded From is rejected at send time — it never silently falls back.
See Sender IDs for the full request flow.

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Compliance

Marketing SMS to Israeli numbers is regulated. Senderz enforces it at the worker:
An SMS to a number without recorded SMS opt-in (smsConsent = subscribed) is rejected. Transactional and OTP are exempt.
Inbound STOP from the carrier DLR webhook suppresses the number within seconds and appends to the consent log.
Marketing SMS is blocked 20:00–08:00 local and during Shabbat (real Jerusalem sunset, with candle-lighting and havdalah offsets).

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Transactional & OTP SMS

Send transactional SMS via the Public API (POST /public/messages/sms), or send one-time codes via the OTP API. Transactional SMS still goes through the wallet and the sender-ID gate, but skips consent, quiet hours and frequency caps because the recipient requested it.