dissolve.js

{
    "application_id":"YOUR_APP_ID",
    "v" : 1.21,
    "src":"https://www.sanfranciscopolice.org/sites/default/files/styles/sfpd_hero_xs_1x/public/image/2019-02/dangerous-dogs-3200x1280-72dpi.jpg?itok=e8t-mftH",
    "functions":[
        {
            "name":"dissolve",
            "params":{
                "src":"https://blitdoc.s3.amazonaws.com/pngs/light-wb.png",
                "gravity" : "NorthWestGravity",
                "x" : 10, "y" : 10,
                "src_percentage" : 0.50,
                "scale_to_fit" : { "height" : 150, "width" : 150 }
            },
            "save":{
                "image_identifier":"MY_CLIENT_ID"
            }
        }
    ]
}