Focused OTP routes
Use an authentication-oriented setup designed around short-lived verification messages.
SMS solution
OTP SMS
Support authentication and verification with time-sensitive messages.
Plan the details before you send.
Message purpose, destination, audience permissions, templates and technical requirements all influence the right SMS setup.
API integration
Generate the code in your system, submit the approved message and validate it securely in your application.
Delivery monitoring
Track available delivery outcomes and define retry or alternate-channel logic for unsuccessful attempts.
Template and expiry planning
Keep messages concise, identify the purpose of the code and use an expiry window appropriate to the risk.
Before launch
Share the destination, expected monthly volume, peak throughput, language, sender requirement and whether messages will be uploaded or triggered through an API.
During delivery
Monitor available submission and delivery outcomes. Invalid numbers, handset availability, carrier filtering, registration issues and destination rules can affect results.
After the campaign
Review audience quality, timing, content length, links and response signals. Use those findings to improve the next campaign or design a multi-channel follow-up.
Detailed planning guide
Design OTP delivery as one part of a secure verification flow.
Generate and validate securely
The application should generate, store and validate the code using appropriate security controls. The SMS platform transports the message but should not become the sole source of verification truth.
Set expiry and retry limits
Choose a short validity period suited to the risk, limit incorrect attempts and prevent repeated resend requests from creating abuse or unnecessary message volume.
Prepare fallback behaviour
Define what the user sees when delivery is delayed or unsuccessful. A resend, alternate channel or support path should avoid exposing whether a sensitive account exists.
Technical setup and measurement.
Preparation: Keep the message concise, name the intended action, show the validity period where appropriate and warn the user not to share the code. Avoid including unnecessary personal or account information. API integration should cover secure authentication, templates, variables, request logging and delivery callbacks without logging the code in unsafe places.
Reporting: Measure submission, delivery, resend frequency, verification completion, expiry and failure patterns separately. A delivered OTP does not mean the user completed verification. Monitor unusual request volume, repeated destinations and application-level abuse signals.
Frequently asked
Questions, answered.
The customer application normally generates and validates the code; the messaging service delivers the approved message.
The expiry should match the transaction risk and user journey. Short validity with clear retry behaviour is generally preferable.
Avoid storing codes in plain logs or exposing them to unnecessary systems and staff.
Use controlled retry, alternate-channel or support logic designed around security and user experience.
Frequently asked
Questions, answered.
Sender formats and approvals depend on the country, route and message category. Share the sender requirement before campaign setup.
API or SMPP connectivity may be available depending on the service and technical requirement.
Number validity, handset status, carrier rules, consent, registration, content, route choice and destination conditions can all influence delivery.
Domestic volume tiers are shown on the pricing page. International SMS requires a destination-specific quotation.
Launch with Canny
Ready to plan your next campaign?
Tell us your audience, destination and channel. We will help you choose the right route and volume.
Bengaluru support team
Plan, launch and improve with one communication partner.
We help businesses choose the right channel, prepare compliant campaign inputs, connect APIs or platforms, and understand delivery and engagement reports after launch.
1. Plan
Share your audience, destination, monthly volume and campaign objective.
2. Launch
Prepare content, templates, integrations and sending schedules with our team.
3. Improve
Review outcomes and refine targeting, timing, content and channel mix.
Contact CannyEmail
info@cannydigitalmarketing.com