type helper for construct Google Chat message
There two type of Google Chat message
they are all represented as a json string.
Text Message represented like
json
{
"text": "some text"
}
Card Message represented like
json
{
"cards": [
{
"sections": [
{
"widgets": [
{
"image": { "imageUrl": "https://..." }
},
{
"buttons": [
{
"textButton": {
"text": "OPEN IN GOOGLE MAPS",
"onClick": {
"openLink": {
"url": "https://..."
}
}
}
}
]
}
]
}
]
}
]
}
the relationship between elements of cards should looks like below
you should construct Cards or Text struct, then serialize them to json string as a Google Chat API(for instance incoming webhook) http request body.