Submit portal registration application

An example with all fields types:

{
    "fields": [
        {
            /* file */
            "id": 523423,
            "value": "SGVsbG8gV29ybGQ=",
            "filename": "helloworld.txt"
        },
        {
            /* text */
            "id": 523591,
            "value": "James"
        },
        {
            /* multiline */
            "id": 524022
            "value": "line 1\r\nline 2"
        },
        {
            /* checkbox */
            "id": 524156
            "value": true
        },
        {
            /* checkboxes */
            "id": 524221
            "value": {
                "3251": true,
                "3991": true
            }
        },
        {
            /* radio/select */
            "id": 524221
            "value": {
                "4126": true
            }
        }
    ],
    "source": "Google"
}