How to Collect WhatsApp Opt-ins Legally and Effectively

Collecting WhatsApp opt-ins is essential for any business looking to leverage WhatsApp’s massive reach for marketing or customer communication. WhatsApp boasts nearly unparalleled engagement – with about 98% open rates and 45–60% click-through rates, far higher than email. But before you can tap into this potential, you must obtain customers’ permission (opt-in) to message them. In this comprehensive guide, we’ll explore how to collect WhatsApp opt-ins legally and effectively, ensuring you comply with all rules and get the best results. We’ll cover what WhatsApp opt-ins are, why they matter, proven strategies to gather opt-ins, compliance tips, and how a few tools can be a game-changer. Let’s dive in!

What is a WhatsApp Opt-In and Why Does It Matter

WhatsApp opt-in refers to a customer’s consent to receive messages from your business on WhatsApp. In other words, the user explicitly agrees (“opts in”) to let you send them messages on WhatsApp. This could include promotional updates, order notifications, customer service messages, etc., depending on what they agree to.

Why is this important?

First, it’s required by WhatsApp’s policies and often by law. WhatsApp’s Business Policy clearly states that a business may only contact people if: (a) the person gave you their phone number and (b) you have received their opt-in permission confirming they want to receive messages from you. This rule exists to prevent spam and ensure users only get messages they expect. If you message people without consent, they can block or report you, which can hurt your sender reputation, reduce your WhatsApp “quality rating,” or even lead to account suspension.

Secondly, requiring opt-in builds trust. When customers willingly subscribe, they’re more likely to engage positively with your messages. Opt-ins ensure your WhatsApp outreach is welcome, not intrusive, creating a better experience and relationship with your audience.

WhatsApp Opt-In Rules and Legal Requirements

Collecting WhatsApp opt-ins legally means following both WhatsApp’s platform rules and any applicable data privacy laws (like GDPR). Here are the key requirements and recent updates you should know:

• Explicit Consent: You must obtain a clear, affirmative consent from the user to send them WhatsApp messages. This could be the user checking a box on a signup form, entering their phone number with an agreement, or sending an initial opt-in message to your business. Never assume consent or use pre-ticked boxes – users should intentionally opt in.
  
• Business Identification: When asking for opt-in, identify your business name and the purpose of the messages. Users should know who they are consenting to receive messages from and what types of messages (e.g., “Subscribe to receive [Your Brand]’s product updates on WhatsApp”). Being transparent here is not only good practice but part of WhatsApp’s policy and many laws.
  
• WhatsApp Policy Update (Late 2024): In November 2024, Meta (WhatsApp’s parent company) updated its policy to simplify opt-ins. Now, the opt-in “can be general and not specifically for WhatsApp, as long as businesses comply with all local laws.”. What does this mean? Essentially, if a customer gives you consent to be contacted (and provides their phone number), you may not need a separate WhatsApp-specific checkbox in regions without stricter laws. For example, a general SMS/text marketing opt-in could cover WhatsApp messages too. However – and this is crucial – you still must comply with local regulations. In places like the EU under GDPR, consent typically needs to be specific to WhatsApp despite Meta’s leniency. It’s safest to get a dedicated WhatsApp opt-in, especially in jurisdictions with strict privacy laws.
  
• GDPR and Privacy Laws: If you operate in areas governed by GDPR or similar laws, you need a specific, informed consent for WhatsApp messages. GDPR requires that consent be specific and unambiguous for each communication channel. So, for European customers, it’s wise to explicitly mention WhatsApp in your opt-in request. Also, GDPR mandates principles like data minimization and the right to withdraw consent. Always provide a way for users to opt out easily at any time (for instance, telling them they can reply “STOP” to unsubscribe). Make sure to honor those opt-out requests promptly. Additionally, keep a record of when and how each user consented, in case you need to demonstrate compliance.
  
• No Unsolicited Messaging: Until a user has opted in, do not send them WhatsApp messages for marketing. (Exception: if they message you first, you can reply within 24 hours about that inquiry, but you still cannot push marketing content later without an opt-in.) Sending bulk unsolicited messages is not only against policy but also risks your number being flagged as spam. Always get the opt-in first – it’s both legal protection and good business sense.
  
• Consequences of Non-Compliance: WhatsApp actively monitors for abuse. If users frequently block or report your messages, WhatsApp may lower your quality rating and limit your messaging or even ban your business account. Furthermore, violating laws like GDPR can lead to hefty fines. It’s simply not worth cutting corners. By collecting proper opt-ins, you ensure your WhatsApp marketing remains both effective and safe.
  

Bottom line: Always ask permission and be clear about it. A little upfront effort in obtaining lawful opt-ins will pay off with higher engagement and peace of mind that you’re on the right side of regulations.

👉Tip: In some cases, using a double opt-in process is considered best practice. Double opt-in means after a user signs up (e.g., via a form or link), you send a WhatsApp message asking them to confirm their subscription (for example, by replying “YES”). This extra step, while optional, provides extra proof of consent and ensures the person controlling that phone number indeed wants to hear from you. It’s especially recommended under GDPR for demonstrable consent. We’ll discuss tools to automate this later on.

Proven Strategies to Collect WhatsApp Opt-Ins Effectively

Now that we know the rules, let’s explore how to actually collect opt-ins. The goal is to integrate WhatsApp opt-in opportunities into your customer journey so that subscribing is easy and appealing. Here are some proven strategies:

1. Use Website Pop-Ups and Sign-Up Forms

Your website is a prime place to capture WhatsApp opt-ins. Consider deploying an eye-catching pop-up or banner on high-traffic pages (homepage, blog, etc.), encouraging visitors to subscribe to your WhatsApp updates. For example, a timed pop-up might say: “ Want VIP Deals? Get our updates on WhatsApp – join now and enjoy 10% off your first order!”. Offering an incentive (a discount, exclusive content, etc.) can motivate users to opt in.

In addition to pop-ups, include a WhatsApp opt-in option in your sign-up forms. If you have a newsletter subscription form or account registration, add a simple checkbox like: “Yes, I want to receive updates via WhatsApp.” Make sure this checkbox isn’t pre-checked (remember, consent must be deliberate). You can also integrate opt-in on your “Contact Us” or demo request forms, so when someone inquires, they can tick a box to agree to follow-ups on WhatsApp. Clearly highlight the benefit: e.g., “Get order confirmations and timely offers on WhatsApp for convenience.”

For e-commerce sites, implement a WhatsApp opt-in during the checkout process (more on this below, since it’s so effective it deserves its own section). By placing opt-in opportunities on your site where users are already engaging, you turn web traffic into WhatsApp subscribers seamlessly.

2. Leverage Social Media and Email Invitations

Think about all the followers and subscribers you’ve already built up on other channels – those are potential WhatsApp contacts if you invite them. Use your social media presence to promote your WhatsApp channel. For example, share posts or Stories on Instagram, Facebook, LinkedIn, etc., saying “We’re on WhatsApp!  Sign up to get [valuable content] via WhatsApp – link in bio.” Include a WhatsApp click-to-chat link (or QR code) in your bio or post so that users can easily tap and opt in. You could even pin a tweet or Facebook post explaining how to join your WhatsApp list for updates. Consistently remind your social followers about the benefits of connecting on WhatsApp (like quicker updates, personal tips, or whatever suits your business).

Don’t forget email marketing as well. In your email newsletters, add a section or call-to-action: “Prefer WhatsApp? Click here to get these updates via WhatsApp too!”. You might send a dedicated email to subscribers encouraging them to join your WhatsApp list for real-time alerts or special WhatsApp-only deals. Highlight how WhatsApp messages will complement their emails (not spam them). Since email subscribers already showed interest, many may opt for the convenience of WhatsApp updates as the next step.

Even SMS contacts can be prompted. If you have customers who get SMS texts from you, send a message about your WhatsApp channel, e.g., “Hi! Now you can get instant news and offers via WhatsApp – reply YES to get a signup link.” Always make it one-click or one-step if possible. The key is to use the channels where you’re already engaged with customers and gently nudge them towards WhatsApp.

By leveraging existing channels – social followers, email lists, SMS subscribers – you can cross-promote your WhatsApp opt-in and quickly grow that list with people who already trust your brand.

3. Offer QR Codes for Offline and Online Opt-Ins

QR codes are a fantastic bridge between offline and online opt-ins. WhatsApp allows you to create a QR code that, when scanned, opens a chat with your business (or directs to a WhatsApp opt-in landing page). Print or display these QR codes wherever your audience might see them. For instance:

• In-store or at events: If you have a physical location, place a sign at the cashier or entrance: “Join our WhatsApp list for updates. Scan this code to subscribe.” Anyone with a smartphone can scan and be taken directly to WhatsApp with either a pre-filled opt-in message or simple instructions to send a message. This works great at trade shows, restaurants (on table tents or receipts), or retail checkouts. It captures on-the-spot interest.
  
• Printed materials: Add a WhatsApp QR code to flyers, brochures, product packaging, business cards, or mailers. For example, if you mail catalogs or include inserts in packages, a QR saying “Scan to get shipping updates via WhatsApp” can convert customers to your messaging channel.
  
• Online PDF or website: You can even include QR codes in PDFs or on web pages (especially if expecting mobile view). But if the user is already on their phone, a direct link might be simpler than QR. QR is most useful when the user is not currently on a mobile device or when you want to encourage an immediate scan from a poster or screen.
  

Make sure the QR code is tied to an easy opt-in flow. The simplest approach: have the QR open a WhatsApp chat with a preset message like “I want to subscribe” that the user just sends. Once they send it, you respond (automatically) with a confirmation or welcome – voilà, they’re opted in. Provide a little teaser text near the code explaining what they’ll get by subscribing (e.g., “Scan to get our weekly fashion tips on WhatsApp”). QR codes effectively turn real-world touchpoints into digital opt-ins, expanding your reach.

4. Ask During Customer Service Interactions

One of the most natural moments to collect a WhatsApp opt-in is when a customer is already talking to you or using your services. If someone has reached out for support (via phone, email, or live chat) or when you’re wrapping up a customer service conversation, simply invite them to continue the conversation on WhatsApp in the future. For example, after resolving an issue, your support agent or an automated chat can say: “Glad I could help! By the way, we can send you future updates or tips on WhatsApp so you don’t miss important info. Would you like that?”. If the customer agrees, guide them through the quick opt-in (perhaps by sending them a WhatsApp message to reply to, or by directing them to a sign-up link).

This strategy works well because at the moment of a successful support interaction, the customer’s trust in your company is high. They’ve just received help and are likely to say “sure, why not” to hearing from you on a convenient channel like WhatsApp. The Infobip team found that simply requesting opt-in at the end of a support chat is one of the easiest ways to grow your WhatsApp contacts.

You can also build this into your existing systems. For instance, integrate your helpdesk or CRM so that whenever a ticket is closed or an agent ends a call, an automated follow-up email/SMS can ask for a WhatsApp opt-in with a link. Or during a phone support call, have the agent mention WhatsApp updates and offer to send a quick text with the opt-in link. Even IVR systems (phone menus) can be used: “Press 5 to get updates on WhatsApp.” If they press it, you can text them the WhatsApp opt-in link or number to message.

The idea is to strike while the iron is hot: the customer is engaged and presumably happy with your service. By opting them into WhatsApp at that moment (with their permission, of course), you keep the conversation going on a channel that’s direct and personal. This also shifts future interactions from possibly more expensive channels (like phone calls) to WhatsApp, which can be handled efficiently (even with chatbots or templated answers). It’s a win-win: the customer gets quick info and you get an opt-in.

5. Integrate WhatsApp Opt-In at Checkout

The point of purchase is another prime opportunity to collect WhatsApp opt-ins. When a customer is buying something, they often appreciate receiving immediate confirmations and updates about their order. By offering WhatsApp as a communication channel during checkout, you meet that need and grow your subscriber list.

How to implement it: On your e-commerce checkout page (or in the app), include a checkbox or field like “Yes, send me order updates and exclusive offers on WhatsApp” along with the phone number input. Since the customer is already providing their number for shipping or contact, you can have them simply check a box to consent to WhatsApp messages. Ensure the wording is clear and enticing – e.g., “Get your order confirmation, tracking, and a surprise discount on WhatsApp – opt in.” This way, they understand the value. Also ensure the checkbox is opt-in (unchecked by default).

You can also prompt after the purchase is complete. For example, on the order confirmation page or thank-you page, display a call-to-action: “Receive updates about your order and future deals via WhatsApp – click here to subscribe.” Since the customer just bought something, they’re highly likely to want shipping alerts or support, which WhatsApp can provide conveniently. It’s at this moment that the customer is most receptive to after-sales communication.

If you have a physical store, during checkout at the register, you could similarly ask customers if they’d like a receipt or future offers via WhatsApp. They can sign up on the spot (perhaps by scanning a QR code or providing their number on a form that triggers a WhatsApp message).

By integrating the opt-in into the natural flow of purchase, you’re catching customers when they’re excited about their purchase and want to stay informed. They’ll gladly opt in for “notifications about my order status,” – which you can later transition into marketing messages (that they agreed to). Just be sure to explicitly mention if you’ll also send promotions, or get separate opt-ins for marketing vs. purely transactional messages to stay compliant. Many customers will opt in for order updates (transactional messages), and if you plan to also send occasional offers, it’s best practice to have them agree to that category as well.

This strategy not only boosts opt-ins but can also improve customer experience by providing a channel they love for post-purchase communication. It’s a no-brainer for any online retailer.

6. Run Click-to-WhatsApp Ads for Instant Opt-Ins

Take your opt-in efforts to the next level by using Click-to-WhatsApp ads. These are ads on platforms like Facebook and Instagram (or even Google search ads with WhatsApp extensions) that include a “Message on WhatsApp” button. Instead of filling a form, interested users tap the ad and are immediately taken to a WhatsApp chat with your business. This instantly converts an ad viewer into a WhatsApp conversation – essentially an opt-in if handled properly.

For example, you might run a Facebook ad that says, “Chat with us on WhatsApp to get a free quote/discount!” When the user clicks, it opens WhatsApp with a pre-filled greeting message (“Hi, I’d like to sign up...”). Once they hit send, you have an open thread to interact, and you can treat that as an opt-in (since the user initiated contact) – though it’s good to still confirm like “Thanks for messaging us! Reply YES to confirm you’d like updates from us.” This way you’ve got explicit confirmation to be safe.

These ads are powerful because they lower the barrier for opt-in – a user just taps a button instead of filling out a form. They also allow you to start a personalized conversation immediately, which is great for engagement. You can even program an automated welcome message or offer through WhatsApp Business API when someone comes in from an ad. For instance, an e-commerce brand could automatically reply, “Hi! Thanks for your interest. Here’s your 10% off code to use right now. Would you like to receive product updates from us on WhatsApp too?”.

Businesses using Click-to-WhatsApp ads have seen impressive results. By engaging customers in chat right from the ad, some companies achieved higher conversion rates and ROI – in fact, using WhatsApp for follow-ups can boost ad return on ad spend (ROAS) significantly. (One report noted up to 7.5× ROAS when retargeting leads on WhatsApp versus standard channels!). Even if that number varies, it’s clear that a warm WhatsApp chat can turn a curious click into a loyal customer much more effectively.

To make the most of these ads, ensure your ad targeting hits the right audience (such as your website visitors or lookalike audiences likely to engage). Then have a plan for the WhatsApp conversation flow – possibly using a chatbot or saved replies to handle common inquiries and lead the user toward an opt-in or sale. For example, an insurance company might run a Google ad for “Get a quote on WhatsApp” – user clicks, enters WhatsApp chat, and the bot gathers info and also asks if they’d like future reminders via WhatsApp.

In summary, Click-to-WhatsApp ads are an excellent tactic to rapidly grow your opt-in list. They combine marketing and opt-in collection in one step. If you run online ads, consider funnelling that traffic directly into WhatsApp chats – you’ll likely see higher engagement and a fast-growing subscriber list.

WhatsApp Opt-In Best Practices and Compliance Tips

Collecting opt-ins is not just about quantity – quality and compliance matter too. To ensure your WhatsApp outreach remains effective and user-friendly, follow these best practices:

• Get Explicit Permission (No Assumptions): Always use a clear opt-in mechanism where the user actively consents (e.g., ticking a checkbox or sending an initial message). Make it crystal clear they are agreeing to WhatsApp messages from your business, and mention your business name in the opt-in prompt. Never auto-enroll people or hide consent in terms & conditions. Explicit consent builds trust and meets legal requirements.
  
• Be Transparent and Specific: Tell users what kind of messages they can expect and how often, so there are no surprises. For example, “We will send you weekly product updates and exclusive promo codes via WhatsApp.” If you have multiple message categories (orders, promotions, news), consider letting them choose or at least informing them of all categories they’re opting into. Transparency up front means users won’t be annoyed later – it actually increases engagement because they get what they signed up for.
  
• Make Opt-In Easy – and Opt-Out Even Easier: Streamline your opt-in process. It should only take a second or two to join (minimal form fields or a quick message). The simpler it is, the more people will complete it. Likewise, provide a one-step opt-out method: for instance, instruct users that they can reply with “STOP” or click an unsubscribe link to quit. And if someone opts out or asks to stop, respect it immediately. By giving users control to unsubscribe anytime, you actually make them more comfortable opting in.
  
• Communicate Value Up Front: Make opting in attractive by highlighting the value to the user. Whether it’s “be the first to know about sales,” “get customer support 24/7,” or “receive important alerts,” state the benefit clearly. Users are more willing to share their WhatsApp if they understand the “what’s in it for me?” Additionally, send a nice welcome message after they opt in, perhaps with a useful tip or small reward (coupon, guide, etc.). This reinforces that subscribing was a good idea and sets a positive tone.
  
• Respect Frequency and Relevance: Once you have opt-ins, don’t abuse the privilege. Stick to the types of messages you promised and avoid over-messaging. Bombarding people with irrelevant messages will lead to opt-outs or blocks. Quality over quantity is key. Segment your WhatsApp audience if possible and personalize messages to their interests or past behavior. For example, if someone opted in for shipping updates, don’t suddenly start blasting daily promos unless they also opted for marketing. Keeping content relevant and at a reasonable frequency will maintain high open rates and low unsubscribe rates.
  
• Keep Records and Stay Secure: For compliance, maintain records of consent – how and when each user opted in (store timestamps, source, etc.). This can protect you if there’s ever a question of whether a user consented. Also, ensure you handle their data (phone numbers, chat data) in line with your privacy policy and regulations. Use secure, official tools (not some unauthorized method of sending WhatsApp messages) to protect user data and your business’s integrity.
  
• Consider Double Opt-In for Clarity: As noted earlier, a double opt-in (having users confirm via WhatsApp message) is a gold-standard practice, especially in jurisdictions like the EU. While not mandatory globally, it provides an extra layer of confirmation. Users who complete a double opt-in are highly engaged and less likely to complain or opt out, since they went through two steps showing they truly want your messages. If feasible, implement it – it can be as simple as an automated “Please reply YES to confirm” message when they first join.
  

By following these best practices, you’ll build a high-quality WhatsApp contact list that is both compliant and primed for engagement. Your subscribers will feel respected and stay happy to hear from you, which is exactly what you want for sustained success.

SendWo: Your Partner for Legal and Effective WhatsApp Opt-Ins

Collecting and managing WhatsApp opt-ins might sound complex – but you don’t have to do it all manually. SendWo comes to the rescue as a hero tool to simplify and supercharge your WhatsApp marketing (while keeping it fully legal and compliant). SendWo is a free WhatsApp marketing platform powered by the official Meta WhatsApp Business API, which means everything you do through SendWo aligns with WhatsApp’s rules by design. Here’s how SendWo can help you with WhatsApp opt-ins:

• Official and Trustworthy: SendWo is an official WhatsApp Business Solution Provider. Using an official API-based tool is crucial – it ensures your opt-in collection and messaging go through approved WhatsApp channels. This drastically reduces the risk of getting banned for policy violations, unlike rogue WhatsApp-sending methods. In fact, SendWo’s infrastructure is built to broadcast messages with no banning issues by adhering to template approvals and rate limits. You can rest easy that your outreach is compliant and reliable.
  
• Easy Opt-In Tools: SendWo offers features like a Website Chat Widget that you can add to your site with no coding. This widget allows visitors to instantly start a WhatsApp chat with you or submit their number – effectively capturing opt-ins right from your webpages. It even supports adding a QR code for your WhatsApp channel, so you can display it online or offline and funnel scans into WhatsApp conversations. By integrating SendWo’s widget, you turn your website traffic into WhatsApp leads on autopilot. No complicated setup – just copy-paste a snippet and you’re live.
  
• Automated Flows and Chatbots: Remember those double opt-in sequences and welcome messages we discussed? SendWo has you covered with WhatsApp Flows and Chatbot capabilities. You can create an automated journey that, for example, asks new subscribers to confirm their opt-in or asks a few preference questions (for better segmentation). The AI chatbot can even handle 24/7 responses, guiding users to provide consent or information in a friendly, human-like way. This means you can collect opt-ins and engage new users without manual effort, at any hour.
  
• Seamless Integrations: SendWo works with popular platforms – from e-commerce like Shopify/WooCommerce to CRM tools – so you can insert WhatsApp opt-in steps into existing workflows easily. For example, with the WooCommerce integration, you can add a WhatsApp opt-in checkbox on the checkout page, and those contacts sync to SendWo automatically for messaging. There’s also integration with form builders like WPForms, allowing any form on your site to feed WhatsApp opt-ins directly into SendWo. This level of integration means no more exporting lists or manual data entry – everything flows into one system.
  
• Broadcasting and Segmentation: Once you’ve grown your opt-in list, SendWo truly shines by letting you broadcast messages in bulk (using WhatsApp-approved message templates) and segment your audience for targeting. You can tag or label contacts (e.g., “interested in product A” vs “interested in product B”) and ensure they only get relevant messages. SendWo’s template manager also helps you create compliance-approved messages with quick reply buttons, images, etc., which makes your campaigns interactive and engaging. With everything in one dashboard, managing even thousands of WhatsApp subscribers becomes organized and efficient.
  
• Analytics and Compliance Features: SendWo provides insights on delivery, read rates, responses, etc., so you can watch how your WhatsApp campaigns perform and refine them. It also keeps track of opt-outs: if anyone replies with STOP or unsubscribe keywords, you can automatically mark or remove them from lists, maintaining compliance effortlessly. All those consent records and user preferences can be stored in the system for auditing. Essentially, SendWo helps handle the “boring” part of compliance in the background while you focus on crafting great messages.
  
• Completely Free to Start: Perhaps best of all, SendWo offers a free-forever plan. This lowers the barrier for you to try it out. You can start collecting WhatsApp opt-ins and sending broadcast messages without hefty costs. As your needs grow, SendWo scales with you (with premium upgrades if needed), but even small businesses can take advantage of official WhatsApp API power thanks to SendWo’s accessible model.
  

In short, SendWo empowers you to do WhatsApp marketing the right way. It combines legal compliance, ease of use, and powerful automation in one platform. Instead of juggling manual opt-in lists and worrying about violating WhatsApp rules, you can rely on SendWo to streamline the whole process – from opt-in collection to engagement. This means higher efficiency for you and a better experience for your customers.

👉 Pro Tip: You can sign up for SendWo in minutes and immediately deploy a WhatsApp chat widget or integrate your WhatsApp Business API number. It’s a practical step to implement all the strategies we discussed here, with far less hassle. Why work harder when a smart tool can do the heavy lifting?

Conclusion- Build Your WhatsApp List the Right Way (And Reap the Rewards)

WhatsApp is a powerful channel to connect with your audience – but success on WhatsApp starts with legally and effectively collecting opt-ins. By now, you’ve learned that getting user consent isn’t just a checkbox exercise; it’s an opportunity to build trust and set the stage for meaningful engagement. From your website pop-ups to social media, from in-store QR codes to online ads, there are numerous creative ways to grow your WhatsApp subscriber list. The key is to always respect the user’s choice: be clear, add value, and comply with policies and laws.

The reward for doing it right is huge. With an opted-in list, you can enjoy those sky-high open rates, instant reach, and interactive conversations that only WhatsApp can offer. Your messages won’t be spam – they’ll be welcomed updates in a channel your customers check daily. Over time, this can boost customer loyalty, increase conversion rates (remember, WhatsApp click-through can be 10x higher than email!), and even open up new avenues like conversational commerce.

Now is the time to put these strategies into action. Start implementing WhatsApp opt-in points across your customer touchpoints. And consider leveraging a robust tool like SendWo to make the whole process smooth and scalable. With SendWo’s free official WhatsApp solution, you can accelerate your opt-in growth and stay compliant effortlessly – it’s like having an expert partner by your side.

Ready to boost your engagement and sales through WhatsApp? Don’t wait for competitors to snatch the opportunity. Act now: set up that website widget, launch a WhatsApp campaign, and invite your customers to join you on WhatsApp. They’ll love the convenience and personal touch, and you’ll love the results. Take the first step today. Sign up for SendWo for free, and start building your WhatsApp opt-in list legally and effectively. Your future loyal audience is just a message away!