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Documentation Index

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CTA URL button messages map a destination URL to a labeled button. Users never see the raw link — they tap the button and the URL opens in their default browser. Use this when you want to drive traffic from WhatsApp to a web experience (a booking page, a product page, a checkout flow) without exposing a long, opaque URL in the message body.

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Send a CTA URL Message

const message = await zavu.messages.send({
  to: "+14155551234",
  channel: "whatsapp",
  messageType: "cta_url",
  text: "Tap the button below to see available dates.",
  content: {
    ctaDisplayText: "See Dates",
    ctaUrl: "https://example.com/schedule?ref=zavu",
    ctaHeaderType: "image",
    ctaHeaderMediaUrl: "https://example.com/banner.png",
    footerText: "Dates subject to change."
  }
});

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Specifications

PropertyRequirement
Body text (text)Required, max 1024 chars
ctaDisplayTextRequired, max 20 chars
ctaUrlRequired, valid URL (HTTPS required by WhatsApp in production)
ctaHeaderTypeOptional: text, image, video, document
ctaHeaderTextRequired if ctaHeaderType is text, max 60 chars
ctaHeaderMediaUrlRequired if ctaHeaderType is image, video or document. HTTPS URL that returns valid media
footerTextOptional, max 60 chars
The sender must have a WhatsApp Business Account connected. Header media URLs are fetched by WhatsApp — they must be publicly reachable and return the declared content type (e.g. image/png for an image header).

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Header Variants

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Text header

"content": {
  "ctaDisplayText": "Book now",
  "ctaUrl": "https://example.com/book",
  "ctaHeaderType": "text",
  "ctaHeaderText": "New workshop dates announced!"
}

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Image header

"content": {
  "ctaDisplayText": "Shop now",
  "ctaUrl": "https://example.com/sale",
  "ctaHeaderType": "image",
  "ctaHeaderMediaUrl": "https://example.com/sale-banner.jpg"
}

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Video header

"content": {
  "ctaDisplayText": "Watch more",
  "ctaUrl": "https://example.com/learn",
  "ctaHeaderType": "video",
  "ctaHeaderMediaUrl": "https://example.com/teaser.mp4"
}

​
Document header

"content": {
  "ctaDisplayText": "Open PDF",
  "ctaUrl": "https://example.com/brochure",
  "ctaHeaderType": "document",
  "ctaHeaderMediaUrl": "https://example.com/brochure.pdf"
}

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No Webhook on Tap

Unlike reply Buttons and Lists, tapping a CTA URL button does not generate an inbound webhook. The user is redirected directly to the destination URL inside their browser.To track clicks, append tracking parameters to ctaUrl (for example ?utm_source=whatsapp&clickID=abc123) and read them on your landing page.

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24-Hour Window

CTA URL messages are free-form interactive messages. They can only be sent inside an open 24-hour conversation window — typically after the user has messaged you first. To initiate a conversation outside the window, send a template message first, then follow up with a CTA URL message once the user replies.

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Use Cases

  • Drive traffic to a booking or scheduling page
  • Link to a checkout or product page from a promotion
  • Share long campaign URLs without cluttering the message
  • Replace raw URLs in receipts or confirmations with a branded button
  • Direct users to a web form, survey, or support portal