Gated content via external site via javascript API

[caomicc]

Hi!
I'm building a site using react, and need to create a method to gate content based on a marketo form. I am using the forms 2.0 and have been able to return a form using the get command for forms.json via REST API endpoint reference for Forms

{
    "id": 2740,
    "name": "Dev Test",
    "description": "",
    "createdAt": "2019-11-25T17:20:58Z+0000",
    "updatedAt": "2022-11-02T23:54:55Z+0000",
    "url": "https://app-aba.marketo.com/XXXXXX",
    "status": "approved",
    "theme": "simple",
    "language": "English",
    "locale": "en_US",
    "progressiveProfiling": false,
    "labelPosition": "above",
    "fontFamily": "Helvetica",
    "fontSize": "13px",
    "folder": {
        "type": "Folder",
        "value": 44,
        "folderName": "Test Forms"
    },
    "knownVisitor": {
        "type": "custom",
        "template": "Welcome back, {{lead.FirstName}} {{lead.LastName}}<br/><br/>{{form.Button:default=Download}}<br/><br/>{{form.NotYou:default=Not you?}}"
    },
    "thankYouList": [
        {
            "followupType": "none",
            "followupValue": null,
            "default": true
        }
    ],
    "buttonLocation": 120,
    "buttonLabel": "Submit",
    "waitingLabel": "Please Wait",
    "workSpaceId": 1
}

My problem is that I do not know / cannot find documentation on how to know if a person has filled out a specific form using the API. Beforehand we were just using redirects to a webinar page and sometimes known visitor HTML, but I would like to not allow anyone to view the gated content if they have not filled out the form but were forwarded that page if that page is not a marketo landing page.

Is there a cookie or API call that marketo has that references if a person has filled out a specific form or am I better off creating a cookie/using local storage from the front end on successful form submit and referencing that instead? Only concern I have going that method is that if someone knows the cookie it could be easily spoofed. I could be missing something in the documentation but I just cannot find it myself.

Thanks in advance!

[SanfordWhiteman]

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Is there a cookie or API call that marketo has that references if a person has filled out a specific form or am I better off creating a cookie/using local storage from the front end on successful form submit and referencing that instead?

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No API endpoint that doesn’t open a monster DOS vulnerability. So in practice: No.

The Marketo REST API in general is not designed to be called in response to individual end user activities without another layer of severe rate limiting and/or authentication on top of it.

I‘m assuming of course that you have too many fields to populate an individual DateTime field when each one is filled out.

[caomicc]

Would it be possible to use the javascript API for it? 

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I‘m assuming of course that you have too many fields to populate an individual DateTime field when each one is filled out.

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And I'm not sure if there are too many fields as I'm not the person setting the forms up but rather building building the front end, but I would go off the assumption that yes there are too many fields. 

[SanfordWhiteman]

No, there's no way to query the Activity Log using the JS API.