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

# API reference

* [Channel Groups](/api/channels-api/api-reference/channel-groups.md)
* [Messaging](/api/channels-api/api-reference/messaging.md)
* [Channels management](/api/channels-api/api-reference/channels-management.md)
* [Channel connectors](/api/channels-api/api-reference/channel-connectors.md)
* [Navigators](/api/channels-api/api-reference/navigators.md)
* [Compliance Keywords Messages](/api/channels-api/api-reference/compliance-keywords-messages.md)
* [Sending Emails](/api/channels-api/supported-channels/programmable-email/sending-emails.md)
  * [Sending Emails](/api/channels-api/supported-channels/programmable-email/sending-emails.md#send-a-plain-text-email)
  * [Sending Emails](/api/channels-api/supported-channels/programmable-email/sending-emails.md#send-an-html-email)
  * [Sending Emails](/api/channels-api/supported-channels/programmable-email/sending-emails.md#send-an-email-to-multiple-participants)
  * [Sending Emails](/api/channels-api/supported-channels/programmable-email/sending-emails.md#html-metadata)
  * [Sending Emails](/api/channels-api/supported-channels/programmable-email/sending-emails.md#send-a-html-message-with-attachments)
  * [Sending Emails](/api/channels-api/supported-channels/programmable-email/sending-emails.md#send-an-html-message-with-inline-images)
  * [Sending Emails](/api/channels-api/supported-channels/programmable-email/sending-emails.md#send-a-message-with-a-template)
  * [Sending Emails](/api/channels-api/supported-channels/programmable-email/sending-emails.md#send-a-message-specifying-the-use-case)
  * [Sending Emails](/api/channels-api/supported-channels/programmable-email/sending-emails.md#send-a-message-with-tags)
* [Sending SMS messages](/api/channels-api/supported-channels/programmable-sms/sending-sms-messages.md)
* [Sending WhatsApp messages](/api/channels-api/supported-channels/programmable-whatsapp/sending-whatsapp-messages.md)