> ## Documentation Index > Fetch the complete documentation index at: https://docs.ycloud.com/llms.txt > Use this file to discover all available pages before exploring further. # Guides > Practical guides for building with the YCloud API. Use these guides to move from your first request to a production integration. ## Choose a workflow Start with a task guide when you know what you want to build. Each task guide explains what the feature does, prerequisites, how it works, a complete request, the response, final status, and common failure modes. Choose between queued and direct sending. Send text messages and track delivery. Send HTML or plain-text email. Receive messages, mark them as read, and show typing indicators. Deliver a verification code through an automated call. ## Build on WhatsApp Inspect connected WABAs, verification, restrictions, and messaging limits. Register senders and manage profiles, commerce, and calling settings. Understand pricing fields, charging rules, and when message prices become final. Create and manage approved message structures. Build, preview, publish, and deprecate structured experiences. Upload reusable media for WhatsApp messages. Connect, accept, reject, and terminate calls. Send messages and calls without relying on a user's phone number. ## Manage customer data Create and maintain customer profiles. Define and send customer activity events. Record and enforce channel opt-outs. Monitor available account funds and currency. ## Understand the API Authenticate securely with an API key. Handle failures and retries safely. Iterate through list endpoints. Receive events from YCloud. ## Adapt a working example Follow visual walkthroughs with instructions, requests, responses, and implementation notes. Create template variants with screenshots and annotated request examples. Review prerequisites, event behavior, and scenario-specific payloads. Explore every supported event type and named payload example. ## Move from guide to reference Use a guide to understand behavior and integration choices. Use the API Reference to inspect every request field, response field, and enum value. Use webhook examples to test your event handler before production traffic arrives. This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.