Programmatically generate slideshow videos API

{
    "timeline": {
        "soundtrack": {
            "src": "https://shotstack-assets.s3.ap-southeast-2.amazonaws.com/music/unminus/ambisax.mp3",
            "effect": "fadeOut"
        },
        "fonts": [
            {
                "src": "https://templates.shotstack.io/basic/asset/font/manrope-extrabold.ttf"
            },
            {
                "src": "https://templates.shotstack.io/basic/asset/font/manrope-light.ttf"
            }
        ],
        "background": "#000000",
        "tracks": [
            {
                "clips": [
                    {
                        "asset": {
                            "type": "image",
                            "src": "https://shotstack-assets.s3.ap-southeast-2.amazonaws.com/images/realestate1.jpg"
                        },
                        "start": 0,
                        "length": 6,
                        "effect": "zoomInSlow",
                        "transition": {
                            "in": "fade"
                        },
                        "offset": {
                            "x": 0,
                            "y": 0
                        },
                        "position": "center"
                    },
                    {
                        "asset": {
                            "type": "image",
                            "src": "https://shotstack-assets.s3.ap-southeast-2.amazonaws.com/images/realestate2.jpg"
                        },
                        "start": 6,
                        "length": 6,
                        "effect": "slideLeftSlow"
                    },
                    {
                        "asset": {
                            "type": "image",
                            "src": "https://shotstack-assets.s3.ap-southeast-2.amazonaws.com/images/realestate3.jpg"
                        },
                        "start": 12,
                        "length": 6,
                        "effect": "slideRightSlow"
                    },
                    {
                        "asset": {
                            "type": "image",
                            "src": "https://shotstack-assets.s3.ap-southeast-2.amazonaws.com/images/realestate4.jpg"
                        },
                        "start": 18,
                        "length": 6,
                        "effect": "slideUpSlow"
                    },
                    {
                        "asset": {
                            "type": "image",
                            "src": "https://shotstack-assets.s3.ap-southeast-2.amazonaws.com/images/realestate5.jpg"
                        },
                        "start": 24,
                        "length": 6,
                        "effect": "slideLeftSlow"
                    },
                    {
                        "asset": {
                            "type": "image",
                            "src": "https://shotstack-assets.s3.ap-southeast-2.amazonaws.com/images/realestate1.jpg"
                        },
                        "start": 30,
                        "length": 6,
                        "effect": "zoomInSlow"
                    }
                ]
            }
        ]
    },
    "output": {
        "format": "mp4",
        "size": {
            "width": 1280,
            "height": 720
        }
    }
}