Optional.By default, WhatsApp recognizes URLs and makes them clickable, but you can also include a preview box with more information about the link. Set this field to true if you want to include a URL preview box.The majority of the time when you send a URL, whether with a preview or not, the receiver of the message will see a URL that they can click on.URL previews are only rendered after one of the following has occurred:The business has sent a message template to the user.The user initiates a conversation with a “click to chat” link.The user adds the business phone number to their address book and initiates a conversation.Default: false
Required for text messages.The text of the text message that can contain URLs and supports formatting. To view available formatting options, see Text Object Formatting Options.If you include URLs in your text and want to include a preview box in text messages (“preview_url”: true), ensure it starts with http:// or https://. You must include a hostname, since IP addresses are not matched.Maximum length: 4096 characters.