Drive conversion
Copy-code, one-tap, and zero-tap patterns reduce drop-off versus typing an SMS code.
Message categories
Authentication messages
WhatsApp authentication messages deliver one-time passcodes for signup, login, checkout, and account recovery on an encrypted channel customers already have open. They use Authentication templates with copy-code or one-tap actions — not marketing copy.
Authenticate customers quickly and safely with one-time passcodes on WhatsApp — a convenient, highly visible channel with native copy-code and one-tap buttons.
OTP API
Developer-ready send + verify flow
Developer-ready send + verify flow
₹0.115
Indicative India auth conversation (Meta)
Indicative India auth conversation (Meta)
Copy-code
Native WhatsApp actions, not a custom keypad
Native WhatsApp actions, not a custom keypad
What are WhatsApp authentication messages?
WhatsApp authentication messages are Cloud API templates built for one-time passwords and verification codes. Typical uses: new account creation, login, password recovery, checkout confirmation, and step-up checks before a payout or delivery. Messages can include copy-code or one-tap autofill so users do not retype a six-digit code. Validity windows are short by design.
Ominiflow exposes a WhatsApp OTP API so your backend generates the code, we deliver the approved authentication template, and you verify on the server. Meta authentication conversation fees are passed at cost. Pair WhatsApp-first delivery with SMS fallback for numbers that cannot receive WhatsApp.
Last updated: August 2026
Authenticate securely
End-to-end encryption in transit, short-lived codes, and delivery to the number that owns the account.
Onboard faster
New account verification on a channel people already check.
Protect revenue
Confirm checkout, delivery, or payout with a fresh code when the risk is high.
Where authentication messages fit
Use authentication when the user must prove they control a phone number — not when you want to sell them something.
New account creation
Onboard new customers with a verification code before they enter the product.
- Confirm the number at signup
- Block throwaway or mistyped numbers early
Account recovery
Let customers get back into an account without waiting on email that lands in spam.
- Password reset codes on WhatsApp
- Step-up verification for a new device
New orders & transactions
Confirm a purchase or high-risk action at checkout with an authentication template.
- Checkout OTP before payment capture
- Transfer or payout confirmation
Existing orders & transactions
Require a code at delivery or before changing an address so the order reaches the right person.
- COD or doorstep verification
- Protect existing revenue from account takeover
Popular use cases
Signup OTP
Verify a new account before the first session.
Login / 2FA
Passwordless or second-factor codes on WhatsApp.
Checkout confirm
Prove the buyer controls the number on the order.
Password recovery
Short-lived reset codes users actually see.
How Ominiflow runs authentication messages
- Approve an Authentication template — no marketing language
- Your app generates and hashes the code; we only deliver it
- WhatsApp OTP API plus webhooks for delivery receipts
- Optional SMS fallback when WhatsApp cannot deliver
- Meta authentication fees at cost; usage-based OTP options on the OTP page
Explore additional message categories
Marketing, utility, authentication, and service each bill differently. Use the category that matches the job — not the one that is cheapest to sneak a promo through.
Message categories
Marketing messages
Nurture relationships from first opt-in to repeat purchase. Drive interest, conversion, and re-engagement with promotional WhatsApp marketing messages that customers actually open.
Message categories
Utility messages
During and after purchase, utility messages keep customers informed with time-sensitive updates. Fewer “where is my order?” calls, fewer missed deliveries, and a thread they already trust.
Message categories
Customer service messages
Respond promptly to user-initiated queries with your own chatbot and managed live chat. Personalized service on WhatsApp builds relationships and cuts the cost of phone and email queues.
Frequently Asked Questions
What are WhatsApp authentication messages?
Cloud API templates for one-time passwords and verification. They are a separate conversation category from marketing, utility, and service. Copy-code and one-tap buttons are supported on authentication templates.
Is this the same as WhatsApp OTP?
Yes in practice. OTP is the product use case; authentication is Meta’s conversation category and template type. Ominiflow’s WhatsApp OTP API sends authentication templates.
Can I add a promo line to an OTP template?
No. Authentication templates must stay verification-only. Promotional copy belongs in marketing messages with marketing opt-in.
Is WhatsApp OTP cheaper than SMS in India?
Often, for smartphone users who already have WhatsApp. Indicative Meta authentication in India is about ₹0.115 per conversation versus typical DLT SMS OTP at ₹0.12–₹0.20 per message. Keep SMS as fallback.
Do I need the consumer WhatsApp app to send OTPs?
No. You need WhatsApp Business Platform (Cloud API), a registered number, and an approved authentication template. The phone Business App is not an OTP API.
Ready to send WhatsApp OTPs?
Connect Cloud API, approve an authentication template, and call the OTP send endpoint. Docs and Pay As You Go options are on the WhatsApp OTP page.
Free setup · Full platform access · No markup on Meta fees
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