> ## Documentation Index
> Fetch the complete documentation index at: https://help.chatarmin.com/llms.txt
> Use this file to discover all available pages before exploring further.

# GDPR-compliant WhatsApp marketing

> Differences Double Opt in/Single Opt in/Transactional Opt-In

Differences Double Opt in/Single Opt in/Transactional Opt-In

<CardGroup cols={2}>
  <Card title="Best Practises Opt in/Double Opt In" href="/gdpr-compliant-whatsapp-marketing/best-practises-opt-indouble-opt-in" icon="whatsapp">Practical guidelines for GDPR-compliant WhatsApp messages with chatarmin Sending marketing messages on WhatsApp without adhering to privacy laws like...</Card>
  <Card title="Best Practices Opt-Out" href="/gdpr-compliant-whatsapp-marketing/best-practices-opt-out" icon="whatsapp">GDPR-Compliant Opt Out This guide covers GDPR-compliant Opt-Out processes for WhatsApp marketing: Make opting out as simple and reliable as opting in...</Card>
</CardGroup>