Transactional SMS, WhatsApp & RCS APICritical updates, delivered when your customers need them.

Send OTPs, order confirmations, delivery alerts, booking passes, fund-transfer notifications and bank statements through Text SMS, WhatsApp and RCS — using one scalable messaging platform.

One API platformBuilt for high-volume traffic99.92% SLA

What are transactional messages?

Transactional messages are service-related communications triggered by a customer action or an account event. They help people verify identity, track an order, access a booking, or stay informed about a financial transaction. They are informational — not promotional — and follow the applicable channel rules and consent requirements.

OTP

OTP & Login Verification

Send one-time passwords and sign-in codes the moment a customer logs in, signs up, resets a password or approves a payment. Short, time-bound and built to arrive when it matters.

Login OTPSign-up verificationPassword reset
Best onSMSWhatsApp
Order booking confirmation icon

Order Booking Confirmation

Confirm every purchase or reservation right after checkout, with the order ID, amount, items and expected delivery date, so customers know it went through.

Order IDAmount paidDelivery date
Best onWhatsAppSMS

Out-for-Delivery Alerts

Keep customers updated from dispatch to doorstep with delivery windows, courier details and a tracking link, and cut down on “Where is my order?” queries.

DispatchedOut for deliveryDelivered
Best onWhatsAppSMS
Booking pass and ticket icon

Booking Passes & Tickets

Share QR passes, seat or slot details, venue directions and add-to-calendar actions in one clear message that customers can open and show at the gate.

QR passDirectionsAdd to calendar
Best onRCSWhatsApp
Mobile fund transfer alert icon

Fund Transfer Alerts

Notify customers about credits, debits and transfers with the amount, reference number and time, helping them spot unfamiliar account activity quickly.

Credit / debitReference numberAccount activity
Best onSMSWhatsApp

Bank Statements & Documents

Let customers know when a statement, invoice or receipt is ready and guide them to a secure, approved link, without placing sensitive details in the message itself.

Statement readyInvoiceReceipt
Best onWhatsAppSMS

What is the best channel for transactional messages?

The best channel depends on reach, urgency, message complexity, customer preference and the type of content. Use SMS for dependable text reach, WhatsApp for conversational updates, and RCS for richer native messaging where supported.

Broad text reach

Text SMS API (A2P)

Simple, concise and suitable for alerts that need to reach a mobile number without requiring a messaging app.

VM-PAYWLT-S · SMS
PayWallet: Your login OTP is 482916. Valid for 5 minutes. Do not share it.Now · Example message
Payment of ₹1,250 received. Ref: TXN82416.Now · Example message

Choose SMS when…

  • You need OTPs, short alerts or transaction references.
  • You want to reach customers without depending on an app.
  • The message is brief and primarily text-based.
Best fit: OTPs, payment alerts, login codes and critical fallback notifications.
Rich native experience

RCS Business Messaging

Enhance Android messaging with branded sender profiles, rich cards, images and suggested actions.

Eventique · Verified brand*
Booking confirmed!
Your event pass is ready. View your booking details and directions.Example RCS card
View pass · Get directions
*Brand verification and features depend on device, carrier and market.

Choose RCS when…

  • You want branded, visual or interactive messages.
  • Product cards, ticket details or suggested actions improve the journey.
  • Your audience has RCS-supported devices and carriers.
Best fit: rich booking passes, guided service journeys and branded alerts.
USE CASE
RECOMMENDED CHANNEL
WHY
OTP / login verificationText SMSShort, direct code delivery with broad mobile reach.
Order confirmation / deliveryText SMSorWhatsAppSMS for concise alerts; WhatsApp for tracking and conversation.
Booking pass / ticket detailsWhatsApporRCSRicher content, buttons and supported media.
Fund transfer alertText SMSKeep the alert concise; follow financial-sector and security rules.
Bank statement availabilityWhatsApporText SMSNotify the customer, then use a secure authenticated portal for sensitive documents.

Channel availability, message classification, template approvals, consent and delivery depend on the applicable operator, platform and regulations.

One transactional messaging API for high-volume communication

SMS2ORBIT brings Text SMS, WhatsApp Business and RCS APIs together, so your application sends the right message through the right channel — without managing separate integrations for every channel.

Unified integration

Integrate once with documented API endpoints and connect to all supported channels.

Designed to scale

Handle high-volume, event-driven traffic with capacity planning, monitoring and queue management.

Operational visibility

Delivery reports, request IDs and status callbacks help your team track every message.

10K+API integrations completed
20 MillionMessages processed daily
99.92%Service-level availability (SLA)

Integrate transactional messaging with your app or software

Connect your website, mobile app, ERP, CRM, e-commerce platform, fintech system or enterprise software through API integration.

Share your use case

Define the event, message type, expected volume, channel and delivery requirements.

Get API credentials

Receive the endpoint, authentication details, templates and integration guidance.

Integrate & test

Connect your system, validate payloads and test delivery statuses.

Go live & monitor

Launch with agreed capacity and monitor message status, usage and performance.

— SMS2ORBIT IS TRUSTED BY 500+ ENTERPRISES —

Loved By Growing Businesses

A few examples of the impact transactional SMS, WhatsApp and RCS messaging typically has once teams switch over.

★★★★★

"WhatsApp API helped us cut our messaging costs while nearly tripling click-through rates on seasonal campaigns. The rich media messages make our promotions actually look premium instead of just another text."

PS
Priya Sharma
Growth Marketing Lead, D2C Fashion Brand
★★★★★

"We were live in under two days. Our support team now handles appointment confirmations and reminders directly inside WhatsApp instead of juggling three different tools."

AM
Arjun Mehta
Operations Manager, Healthcare Services
★★★★★

"The verified business badge alone improved our open rates. Customers trust messages from us now instead of assuming it's spam and ignoring it like they did with SMS."

NK
Neha Kapoor
Digital Marketing Manager, Fintech Startup
★★★★★

"Our catalog finally looks the way it does on our website. Customers browse our full furniture range and check swatches right inside WhatsApp before they ever call the store."

RV
Rohit Verma
Founder, Home Décor Store
★★★★★

"Course reminders and quick-reply doubts used to live on three different apps. Now it's one WhatsApp thread per student, and our batch attendance has genuinely gone up."

AI
Ananya Iyer
Customer Success Lead, EdTech Platform
★★★★★

"Abandoned cart messages with the actual product image and a one-tap 'Complete Order' button recovered sales we used to just lose. It's a different conversation than a plain SMS."

VS
Vikram Shah
E-commerce Manager, Electronics Retailer
★★★★★

"Our loyalty point reminders went from being ignored as spam to actually driving repeat visits. Customers reply to the chat directly to redeem points now."

KR
Kavya Reddy
Brand Manager, Beauty & Wellness
★★★★★

"Test drive follow-ups used to fall through the cracks between calls. Now every lead gets a rich message with the model, offer and a 'Book Test Drive' button automatically."

SN
Suresh Nair
Regional Sales Head, Automobile Dealership
★★★★★

"Booking confirmations with the QR ticket right inside WhatsApp cut our support queries almost in half. Guests just don't lose the message the way they lose an SMS."

MJ
Meera Joshi
CRM Lead, Travel & Hospitality
★★★★★

"We send our weekly specials as one rich message with photos of the actual dishes. Repeat orders from regulars jumped within the first month of switching from SMS."

AK
Aditya Kumar
Founder, Local Restaurant Chain

Illustrative testimonials representative of typical customer feedback.

Connectivity designed for dependable delivery

SMS2ORBIT brings messaging APIs and connectivity options together to help enterprises manage critical notifications at scale.

Telecom operator connectivity

Operator and TSP connectivity supports message routing, delivery reporting and operational escalation for SMS traffic.

WhatsApp Business ecosystem

Built on the Meta WhatsApp Business Platform for approved templates, service conversations and business messaging features.

Channel-aware routing

Plan the right channel for each use case and define fallback behaviour where available and permitted.

Keep critical customer communication moving

For transactional messaging, reliability matters: a delayed OTP can block a login, a missed payment alert creates uncertainty, and a late delivery update increases support calls.

Service-level availabilityPlatform uptime commitment backed by multi-route connectivity, backup infrastructure and active monitoring.

How SMS2ORBIT supports service continuity

Multiple connectivity options

Connectivity planning across available operator/TSP routes.

Route management

Routing decisions based on availability and use case.

Backup gateway & servers

Resilience design that reduces single points of failure.

Monitoring & escalation

Operational visibility and fast incident handling.

Frequently asked questions about transactional messaging

Quick answers to common questions about channels, integration, security and delivery.

What is the difference between transactional and promotional messages?

Transactional messages communicate service information triggered by an event, such as an OTP, order update or account alert. Promotional messages are meant to market or promote an offer (see promotional bulk SMS). Classification and delivery rules depend on applicable regulations and channel policies.

Can I send transactional messages through SMS, WhatsApp and RCS?

Yes. SMS2ORBIT helps businesses integrate SMS, WhatsApp Business API and RCS use cases. Availability depends on account setup, approved templates, destination coverage and channel policies.

Which channel is best for OTPs?

Text SMS is most commonly used for OTPs because it reaches any mobile number without requiring a specific messaging app. See our OTP SMS service. Your security and delivery requirements should guide the final setup.

Can one API handle millions of messages?

Yes — SMS2ORBIT processes 20 million+ messages daily. Actual throughput depends on your traffic pattern, approved capacity and operator/platform limits. Share your peak messages-per-second and daily volume so the solution can be sized correctly.

How long does API integration take?

Timing depends on your software, security requirements, message templates, testing and approvals. SMS2ORBIT shares an implementation plan after reviewing your use case and technical scope.

Are transactional messages always delivered instantly?

No provider can guarantee instant delivery to every handset. Delivery can be affected by network conditions, device availability, carrier filtering and incorrect recipient details. Delivery reports help your team monitor message status.

Can sensitive bank statements be sent on WhatsApp?

For sensitive documents, the safer approach is to notify the customer that a statement is ready and direct them to an authenticated, access-controlled portal rather than exposing confidential information in a message.

How does SMS2Orbit help reduce failed OTP and notification deliveries?

SMS2Orbit uses optimized routing and delivery monitoring mechanisms to improve the success rate of critical transactional messages. This helps businesses reduce missed OTPs, delayed alerts, and customer verification issues.

Can growing businesses scale their transactional SMS volume with SMS2Orbit?

Yes. SMS2Orbit is designed to support both small businesses and high-volume enterprises. As messaging requirements increase, businesses can continue sending account alerts, authentication codes, and service notifications without changing platforms.

What makes SMS2Orbit transactional SMS different from promotional messaging services?

SMS2Orbit transactional SMS services focus on business-critical communications such as verification codes, payment confirmations, order status updates, and security alerts. These messages are intended to deliver essential information rather than marketing content.

What does a 99.92% SLA mean?

An SLA is a defined service commitment measured over a specified period. SMS2ORBIT's 99.92% SLA reflects platform availability; end-to-end delivery also depends on downstream networks and platforms.

Ready to integrate?

Make every important update count.

Talk to SMS2ORBIT about your transactional messaging use case, expected volume and the right mix of SMS, WhatsApp and RCS. Get guidance on API integration, routing, onboarding and capacity planning.

SMS2ORBIT · Text SMS | WhatsApp Business API | RCS Messaging | Voice Call