MsgVariantImage

WebP input is converted to static PNG for WhatsApp and Twilio MMS (first frame for animation); other channels retain WebP. WhatsApp WebP stickers use stickerUrl.

imageUrlstring<uri>required

mimeTypestring

Concrete MIME type such as image/jpeg; wildcards such as image/* are not valid.

textstring

context object

messageIdstringrequired

MsgVariantImage

{
  "imageUrl": "string",
  "mimeType": "string",
  "text": "string",
  "context": {
    "messageId": "string"
  }
}