> For the complete documentation index, see [llms.txt](https://helpdocs.ycloud.com/help-center/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://helpdocs.ycloud.com/help-center/integrations/channels.md).

# Channels

- [Global SMS](https://helpdocs.ycloud.com/help-center/integrations/channels/global-sms.md)
- [Getting Started](https://helpdocs.ycloud.com/help-center/integrations/channels/global-sms/getting-started.md)
- [SMS Basic Principles](https://helpdocs.ycloud.com/help-center/integrations/channels/global-sms/sms-basic-principles.md)
- [SMS Features](https://helpdocs.ycloud.com/help-center/integrations/channels/global-sms/sms-features.md)
- [API Interface](https://helpdocs.ycloud.com/help-center/integrations/channels/global-sms/sms-features/api-interface.md)
- [SMPP](https://helpdocs.ycloud.com/help-center/integrations/channels/global-sms/sms-features/smpp.md)
- [Mass Messaging](https://helpdocs.ycloud.com/help-center/integrations/channels/global-sms/sms-features/mass-messaging.md)
- [Sender ID](https://helpdocs.ycloud.com/help-center/integrations/channels/global-sms/sms-features/sender-id.md)
- [Verify](https://helpdocs.ycloud.com/help-center/integrations/channels/verify.md)
- [Getting Started](https://helpdocs.ycloud.com/help-center/integrations/channels/verify/getting-started.md)
- [Verification Features](https://helpdocs.ycloud.com/help-center/integrations/channels/verify/verification-features.md)
- [Verification Message Templates](https://helpdocs.ycloud.com/help-center/integrations/channels/verify/verification-features/verification-message-templates.md)
- [Security Settings](https://helpdocs.ycloud.com/help-center/integrations/channels/verify/verification-features/security-settings.md)
- [Verification Analysis](https://helpdocs.ycloud.com/help-center/integrations/channels/verify/verification-features/verification-analysis.md)
- [Custom OTP](https://helpdocs.ycloud.com/help-center/integrations/channels/verify/verification-features/custom-otp.md)
- [Best Practices for Verification](https://helpdocs.ycloud.com/help-center/integrations/channels/verify/best-practices-for-verification.md)
- [Best Practices](https://helpdocs.ycloud.com/help-center/integrations/channels/verify/best-practices-for-verification/best-practices.md)
- [Verification Channel Selection](https://helpdocs.ycloud.com/help-center/integrations/channels/verify/best-practices-for-verification/verification-channel-selection.md)
- [Verification via WhatsApp](https://helpdocs.ycloud.com/help-center/integrations/channels/verify/best-practices-for-verification/verification-via-whatsapp.md)
- [Preventing Fraud and Invalid Registrations](https://helpdocs.ycloud.com/help-center/integrations/channels/verify/best-practices-for-verification/preventing-fraud-and-invalid-registrations.md)
- [Email](https://helpdocs.ycloud.com/help-center/integrations/channels/email.md)
- [Getting Started](https://helpdocs.ycloud.com/help-center/integrations/channels/email/getting-started.md)
- [Basic Principles](https://helpdocs.ycloud.com/help-center/integrations/channels/email/basic-principles.md)
- [Email Features](https://helpdocs.ycloud.com/help-center/integrations/channels/email/email-features.md)
- [Domain Configuration](https://helpdocs.ycloud.com/help-center/integrations/channels/email/email-features/domain-configuration.md)
- [Sending Emails via API](https://helpdocs.ycloud.com/help-center/integrations/channels/email/email-features/sending-emails-via-api.md)
- [Monitoring and Optimization](https://helpdocs.ycloud.com/help-center/integrations/channels/email/email-features/monitoring-and-optimization.md)
- [Best Practices for Email](https://helpdocs.ycloud.com/help-center/integrations/channels/email/best-practices-for-email.md)
- [Separate Marketing Subdomain](https://helpdocs.ycloud.com/help-center/integrations/channels/email/best-practices-for-email/separate-marketing-subdomain.md)
- [Warm-up Sending](https://helpdocs.ycloud.com/help-center/integrations/channels/email/best-practices-for-email/warm-up-sending.md)
- [Email Template Samples](https://helpdocs.ycloud.com/help-center/integrations/channels/email/email-template-samples.md)


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