How to post a submission in swift

My arguments never get passed through to fill the form questions. Can you see anything I am doing wrong?

let url = URL(string: "https://api.jotform.com/form/\(Constant.jotformFormId)/submissions?apiKey=\(Constant.jotformApiKey)")!

    var request = URLRequest(url: url)

    request.httpMethod = "POST"

    let postString = "submission[0]=answer1&submission[1]=answer2"

    request.httpBody = postString.data(using: .utf8)

I'm not really familiar with swift programming but these articles may help you.

How-to-send-Submissions-to-Your-MySQL-Database-Using-PHP

-Send-Submission-Data-via-Post-Method-and-Thank-You-Settings

Hope this information helps.

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