Background Content (Object)

This is the content that makes the background of the message.

{
    "type": "image",
    "url": "IMAGE_URL",
    "alt_text": "Black Background Image",
    "initial_frame": ""
}

alt_text
Type: string

Alternate text that appears if the app cannot render the background content of the message
initial_frame
Type: string

The initial frame or first frame is what appears behind the play button before a user taps it to start playing the video.
type
Type: string

The type of the background content. It can be an image or a color.
url
Type: string

The URL of the image that will be used as the background