Account Verification by WhatsApp OTP: Cheaper than SMS in Morocco

When a new user registers on your platform, you send them a verification code. Until now, everyone used SMS. But in Morocco, 93% of smartphones have WhatsApp installed. This number changes everything. An OTP sent by WhatsApp arrives in an application that the user already consults constantly — not in SMS where it drowns out promotional codes and SPAM. The opening rate for a WhatsApp message is 98% compared to 72% for an SMS. The user sees the code, presses “Copy Code” — a built-in native button — and the code is already on their clipboard before they even return to your app. Result: fewer entry errors, fewer abandonments during registration, better conversion rate.

On EnvoiSMS.ma, a WhatsApp OTP costs 0.65 MAD per verification, compared to 0.792 MAD for an SMS with the default sender. The difference applies to every registration, with no minimum volume. The financial advantage is amplified by the fact that WhatsApp offers a better conversion rate: fewer users abandon registration when the code is easy to retrieve. In practice, you also have fewer code resends (retry). The optimal strategy: WhatsApp first, SMS as automatic backup. If WhatsApp fails (off network, non-WhatsApp number), the system automatically switches to SMS. This is the native operation of the EnvoiSMS.ma API.

The implementation on EnvoiSMS.ma is done in two steps: 1. Send the code via the REST API. When registering, your backend calls POST /v1/messages with channel: "whatsapp" and a copy_code button. The system first tries WhatsApp. If the user does not have WhatsApp or is offline, the system automatically switches to SMS without any intervention from your side. 2. Store the code server side with a TTL of 10 minutes in your database or cache (Redis, KV). Never store code in plaintext — hash it with SHA-256. When verifying, compare the hash of the submitted code with the stored hash. On the security side, limit a maximum of 5 attempts per session to prevent brute force attacks. Regenerate a new code after each referral. Invalidate the code immediately after successful verification.

Here is the complete server-side flow in Node.js. When registering: generate a 6-digit code with crypto.randomInt(100000, 999999). Hash it: const hash = crypto.createHash("sha256").update(code.toString()).digest("hex"). Store hash + expiration in your DB. Call the API: POST https://api.envoisms.ma/v1/messages with body: { to: phone, body: "EnvoiSMS: Your code is " + code + ". Valid for 10 min.", channel: "whatsapp", buttons: [{ type: "copy", text: "Copy the code", copy_code: code }] }. When verifying: get hash from DB, check expiration, compare crypto.createHash("sha256").update(submitted).digest("hex") with stored hash. If match: activate the account and delete the code. That's all. No external library, no additional dependencies. The EnvoiSMS API manages the WhatsApp attempt, the SMS fallback, the retry in the event of a network error and the DLR callback.

WhatsApp OTP account verification is considered a transactional message — it does not require prior marketing consent because the user triggered it themselves by signing up. This distinguishes it from promotional campaigns. Compliance points to respect: 1. Mention in your T&Cs that you can contact the user by SMS or WhatsApp to verify their account. 2. Never reuse the number collected during registration for marketing purposes without an additional explicit opt-in. 3. Offer an alternative (email) for users who decline mobile verification. 4. Keep sending logs for at least 1 year (CNDP requirement for processed personal data). EnvoiSMS.ma automatically keeps the metadata of each message (ID, status, timestamp) without the content, in accordance with law 09-08.

Whether you are a startup in the launch phase, a Moroccan SME, a mobile application, or a large group with thousands of registrations per day — WhatsApp OTP verification is accessible to everyone via the EnvoiSMS.ma API. There is no minimum volume, no long-term contract, no hardware to configure. You create an account on EnvoiSMS.ma, you obtain an API key in 30 seconds, and you send your first WhatsApp OTP in less than an hour. The REST API works with all languages ​​(Node.js, PHP, Python, Laravel, Django, Next.js, Ruby on Rails) and all platforms (iOS/Android mobile apps, websites, ERP systems, Shopify/WooCommerce stores). Automatic SMS fallback lets your users receive their code — even those without WhatsApp. Join the hundreds of Moroccan businesses who have already replaced their SMS verification with WhatsApp and cut the cost of every registration today.