> Portal Navigation: > > - Append `.md` to any URL under `https://dev.wix.com/docs/` to get its markdown version. > - Pages are either content pages (article or reference text) or menu pages (a list of links to child pages). > - To get a menu page, truncate any URL to a parent path and append `.md` (e.g. `https://dev.wix.com/docs/sdk.md`, `https://dev.wix.com/docs/sdk/core-modules.md`). > - Top-level index of all portals: https://dev.wix.com/docs/llms.txt > - Full concatenated docs: https://dev.wix.com/docs/llms-full.txt ## Resource: Introduction ## Article: Introduction ## Article Link: https://dev.wix.com/docs/api-reference/crm/communication/introduction.md ## Article Content: # About the Communication APIs The Communication APIs allow you to manage email subscriptions for a site's contacts and communicate with a site's visitors, contacts, and members through Wix Chat, SMS, a Facebook business page, or other channels. With the Communication APIs, you can: + Create, view, and update [subscription details](https://dev.wix.com/docs/rest/crm/communication/email-subscriptions/introduction.md). + Send [messages](https://dev.wix.com/docs/rest/crm/communication/inbox/messages/list-messages.md) on behalf of the business or a visitor. + Retrieve [conversations](https://dev.wix.com/docs/rest/crm/communication/inbox/conversations/conversation-object.md) between a visitor and the business.