# Azmarq Omni API > One apikey header for SMS, WhatsApp, RCS, and OTP. Host: https://api.azmarq.com > Do not use a Bearer token. Store messageId from send responses to match webhooks. > Sitemap: https://developers.azmarq.com/sitemap.xml ## Guides - [Introduction](https://developers.azmarq.com/): Hub, journeys, lifecycle - [Quickstart](https://developers.azmarq.com/quickstart): First SMS - [Authentication](https://developers.azmarq.com/authentication): apikey header - [Errors](https://developers.azmarq.com/errors): Status codes and retry - [Webhooks](https://developers.azmarq.com/webhooks): DLR and inbound events - [Recipes](https://developers.azmarq.com/recipes): First SMS, WhatsApp, OTP, RCS, webhooks - [Changelog](https://developers.azmarq.com/changelog) - [Changelog RSS](https://developers.azmarq.com/changelog/rss.xml) ## Reference - [Catalog](https://developers.azmarq.com/reference) - [SMS](https://developers.azmarq.com/sms): POST /v1/sms - [OTP](https://developers.azmarq.com/generate-and-verify): POST /v1/verify - [WhatsApp](https://developers.azmarq.com/whatsapp): POST /v1/whatsapp - [RCS](https://developers.azmarq.com/rcs): POST /v1/rcs - [Coming soon](https://developers.azmarq.com/coming-soon): CTWA, CDP, journeys, inbox, voice, email, AI, SMPP — no HTTP contract yet ## Clients - [Omni SDK](https://developers.azmarq.com/sdk): npm package azmarqomni - [Omni MCP](https://developers.azmarq.com/mcp): azmarqomni-mcp@0.1.1 - [Postman](https://developers.azmarq.com/postman) ## Integrations - [Shopify](https://developers.azmarq.com/shopify): Azmarq Sender — https://apps.shopify.com/azmarq-sender - [Google Sheets](https://developers.azmarq.com/google-sheets): Azmarq Omni Workspace add-on - [Zoho CRM](https://developers.azmarq.com/zoho): Azmarq for Zoho CRM — https://marketplace.zoho.com/app/crm/azmarq-for-zoho-crm - [Integrately](https://developers.azmarq.com/integrately): https://integrately.com/integrations/azmarq-sms - [Pabbly Connect](https://developers.azmarq.com/pabbly): https://connect.pabbly.com/integrations/azmarq-sms - [Salesforce](https://developers.azmarq.com/salesforce): Custom connect — no POST /v1/salesforce - [LeadSquad](https://developers.azmarq.com/leadsquad): Custom connect — no POST /v1/leadsquad - [WebEngage](https://developers.azmarq.com/webengage): Custom connect — no POST /v1/webengage - [CleverTap SMS](https://developers.azmarq.com/clevertap) - [CleverTap WhatsApp](https://developers.azmarq.com/clevertap-whatsapp) - [MoEngage RCS](https://developers.azmarq.com/MoEngage)