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REST API

Using Javascript to invoke the Iframe

Add JavaScript to invoke the iframe form POST. Place the JavaScript after the closing </body> tag as shown in the example below. The JavaScript invokes the iframe form POST automatically when the window loads. You can also submit the form at a different time, but you must submit it before requesting the validation service.
<script>
window.onload = function() {   
    var stepUpForm = document.querySelector('#step-up-form');
    if(stepUpForm) // Step-Up form exists
    stepUpForm.submit();
}
</script>