Automated SMS That Customers
Actually Expect to Receive
Transactional SMS — triggered by a customer action — has 98% open rates and the highest engagement of any digital channel. SMSPM delivers them to 190+ countries in seconds.
What Is Transactional SMS?
A transactional SMS is sent automatically when a specific customer action or system event occurs — not as part of a marketing broadcast, but as a direct response to something the customer did. Because the customer initiated the interaction, these messages are expected and welcomed.
Common examples include: order confirmation after checkout, shipping notification when a package ships, OTP code after a login attempt, payment receipt after a charge, and appointment reminder the day before a booking.
Transactional SMS is typically exempt from the opt-in consent requirements that apply to marketing SMS, because the message is a direct response to the customer's own action. However, regulations vary by country — review GDPR and local telecoms rules for your markets.
Common Transactional SMS Use Cases
Each of these is a triggered message — sent by your system in response to a specific event.
E-commerce
Trigger: Customer places order
Order #4521 confirmed. Delivery in 2–4 days. Track: shop.com/track/4521
Trigger: Package shipped
Your parcel is on its way! DHL tracking: 1Z999AA10123456784
Trigger: Delivery attempted
Delivery attempt failed. Rescheduled for tomorrow 9–12. Reply CHANGE to update.
Authentication
Trigger: Login attempt
Your verification code is 847392. Valid 10 min. Do not share it.
Trigger: Password changed
Your password was changed. If this wasn't you, contact support immediately.
Trigger: New device login
New sign-in from Berlin, DE. Not you? Secure your account: myapp.com/security
Finance
Trigger: Payment received
Payment of €149 confirmed. Invoice: billing.com/inv-2025-441
Trigger: Card declined
Payment failed for your subscription. Update card: billing.com/update
Trigger: Upcoming renewal
Your subscription renews in 3 days (€49). Manage: account.com/billing
Appointments & Services
Trigger: Booking confirmed
Appointment confirmed: City Clinic, 15 Jun at 10:30. Reply CANCEL to reschedule.
Trigger: Reminder 24h before
Reminder: Your appointment tomorrow at 10:30 AM. Reply CONFIRM or CANCEL.
Trigger: Staff assigned
Dr. Roberts will see you tomorrow. Clinic address: 12 Park St, London.
Integrate in One Afternoon
SMSPM's REST API takes a single GET or POST request. The same send function works for order confirmations, OTP codes, payment alerts — any transactional trigger in your system.
- Works from any language — Node.js, Python, PHP, Ruby, Go
- Delivery report webhooks included — know when messages arrive
- Sender ID support for branded messages ('YourShop' instead of a number)
- Full documentation with copy-paste examples
import os, requests
def send_transactional_sms(to, text, sender='MyShop'):
r = requests.get('https://api.smspm.com', params={
'hash': os.environ['SMSPM_HASH'],
'token': os.environ['SMSPM_TOKEN'],
'toNumber': to,
'fromNumber': sender,
'text': text,
}, timeout=10)
r.raise_for_status()
return r.json()['status'] == 'success'
# Order confirmation
send_transactional_sms(
to='+37256789045',
text='Order #4521 confirmed! '
'Delivery: 15–17 Jun. '
'Track: shop.com/track/4521'
)Transactional vs Marketing SMS — What's the Difference?
| Aspect | Transactional SMS | Marketing SMS |
|---|---|---|
| Trigger | Customer action or system event | Sender-initiated broadcast |
| Opt-in required | Usually not (varies by country) | Yes — explicit opt-in required |
| Opt-out mechanism | Best practice to include | Mandatory in most jurisdictions |
| Expected by recipient | Yes | Sometimes |
| Open rate | 98%+ | 70–90% |
| Typical content | Order #, tracking code, OTP, amount | Offers, discounts, announcements |
| Time of send | Immediate, triggered | Scheduled, batch |
This is a general guide. Consult local regulations (GDPR, TCPA, TRAI etc.) for your specific markets before sending.
Transactional SMS & GDPR Compliance
Transactional SMS are generally less regulated than marketing SMS, but you must still follow the law.
✅ Generally Compliant (GDPR + TCPA)
- • Order confirmations — customer initiated action
- • Delivery notifications — customer expects this
- • OTP / 2FA codes — security-critical, customer requested
- • Payment receipts — transaction confirmation
- • Account notifications — e.g., password reset (customer requested)
⚠️ Requires Care / Legal Review
- • Appointment reminders — generally OK, but confirm consent
- • Account expiry warnings — depends on terms of service
- • Upsell or product recommendations — may require opt-in
- • Regulatory notifications (e.g., ToS changes) — jurisdiction-specific
- • Any SMS to US numbers — TCPA has strict rules; always verify consent
GDPR Checklist for Transactional SMS
- ✓ Lawful basis: Usually Article 6(1)(b) — "contract" or "customer request"
- ✓ Privacy policy: Disclose SMS sending to users (in your privacy notice)
- ✓ Opt-out mechanism: Include "Reply STOP to unsubscribe" (good practice, legally required in some regions)
- ✓ Data retention: Delete message logs after reasonable period (suggest 30–90 days for audit)
- ✓ Data processing agreement: Ensure SMSPM (your SMS vendor) has a DPA in place ✓ (SMSPM has DPA available)
TCPA (US) Key Rules
- ✓ Prior express consent required for any SMS to US numbers (even transactional)
- ✓ Clear opt-in: User must explicitly agree to SMS; pre-checked boxes don't count
- ✓ Opt-out mechanism: "Reply STOP" must work immediately; honor within 48 hours
- ✓ No affiliate transfers: If you share SMS lists, you need fresh consent from each user
- ✓ Safe harbors: Transactional SMS (OTP, receipts) generally have more flexibility
⚠️ Not Legal Advice: This is general guidance, not legal advice. Regulations vary by country and use case. Always consult your legal team before sending transactional SMS, especially for US audiences or sensitive data. SMSPM is not liable for compliance violations.
Start Sending Transactional SMS
Pay per message. No monthly fees. 190+ countries.
Most EU transactional SMS costs under €0.05 per message. View pricing →