Custom Payload Hangouts example

json.json

{
        "hangouts": {
          "header": {
            "title": "Pizza Bot Customer Support",
            "subtitle": "pizzabot@example.com",
            "imageUrl": "https://goo.gl/aeDtrS"
          },
          "sections": [
            
            {
              "widgets": [
                {
                  "keyValue": {
                    "icon": "TRAIN",
                    "topLabel": "Order No.",
                    "content": "12345"
                  }
                },
                {
                  "keyValue": {
                    "topLabel": "Status",
                    "content": "In Delivery"
                  }
                }
              ]
            },
            
            {
              "header": "Location",
              "widgets": [
                {
                  "image": {
                    "imageUrl": "https://dummyimage.com/600x400/000/fff"
                  }
                }
              ]
            },
            
            {
              "header": "Buttons - i could leave the header out",
              "widgets": [          
                {
                "buttons": [
                  {
                    "textButton": {
                      "text": "OPEN ORDER",
                      "onClick": {
                        "openLink": {
                          "url": "https://example.com/orders/..."
                        }
                      }
                    }
                  }
                ]
              }]
            }
          ]
        }
      }

Good example!