While not always legally mandatory

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Explicit Consent Language:

The language used for opt-in should be clear, concise, and unambiguous. Avoid pre-checked boxes or vague statements.
Clearly state what users are opting in to receive (e.g., "Receive exclusive offers and updates via WhatsApp").
Inform them about your privacy policy and how to opt-out.
Two-Way Opt-In (Recommended):

depending on jurisdiction, a two-way opt-in process is a armenia whatsapp number data best practice. This involves the user initiating contact or sending an opt-in message, and then your business sending a confirmation message asking them to confirm their subscription (e.g., "Reply YES to confirm your subscription to our WhatsApp updates"). This double confirmation strengthens consent.
Incentivize Opt-Ins (Ethically):

Offer value in exchange for an opt-in. This could be exclusive discounts, early access to sales, helpful content, or customer support. The incentive should be genuine and relevant to your audience.
Segment Your Audience:

As you collect contacts, segment them based on their interests, preferences, purchase history, or demographics. This allows for highly targeted and personalized messaging, which increases engagement and reduces the likelihood of being blocked.
Regular List Hygiene:

Periodically review your contact list. Remove inactive or unresponsive users. This improves deliverability rates and ensures your messages are reaching engaged individuals.
Promptly process opt-out requests.
WhatsApp Business Tools for Contact Management and Engagement
WhatsApp offers two main avenues for businesses: the WhatsApp Business App (for small businesses) and the WhatsApp Business Platform (API) (for medium to large businesses). Both provide features that facilitate compliant contact management and effective communication.

WhatsApp Business App (for Small Businesses)
The WhatsApp Business App is a free application designed for small businesses to connect with their customers. While it has limitations (e.g., maximum broadcast list size of 256 contacts, limited automation), it offers basic contact management features:

Business Profile: Create a professional profile with business hours, address, website, and catalog.
Labels: Organize contacts with labels (e.g., "New Customer," "Pending Payment," "Loyal Customer"). This allows for basic segmentation.
Broadcast Lists: Send messages to multiple contacts simultaneously. Crucially, messages sent via broadcast lists are only delivered if the recipient has your number saved in their contacts. This inherently encourages businesses to ensure their contacts have opted-in by saving their number.
Quick Replies: Save and reuse frequently sent messages to answer common questions quickly.
Automated Messages: Set up greeting messages for new chats and away messages when you're unavailable.
WhatsApp Business Platform (API) (for Medium to Large Businesses)
The WhatsApp Business Platform (API) is a more robust solution for businesses with larger communication needs. It requires integration with a Business Solution Provider (BSP) and offers advanced features for contact management, automation, and bulk messaging (while adhering to WhatsApp's policies).