Can't make post requests with repeater field. Gravityforms API

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Hey,

I’m using WordPress as a headless CMS and I’m submitting forms using the Gravity Forms API. I have a form with a repeater field where people can invite up to 3 friends/families.

My problem is that I just can’t seem to make form submissions work for the repeater field. Every other form that does not include repeater fields I can make submission successfully.

This is how I’ve created my repeater fields:

function setup_form_fields($form) {
    $email = GF_Fields::create(array(
        'type' => 'email',
        'id' => 1001,
        'formId' => $form['id'],
        'isRequired' => true,
        'label' => __('Email Address receiver'),
        'pageNumber' => 1,
    ));

    $name = GF_Fields::create(array(
        'type' => 'text',
        'id' => 1002,
        'formId' => $form['id'],
        'isRequired' => true,
        'label' => __('Name receiver'),
        'pageNumber' => 1, 
    ));

    $invitees = GF_Fields::create(array(
        'type' => 'repeater',
        'description' => '',
        'id' => 1000,
        'formId' => $form['id'],
        'label' => '',
        'addButtonText' => '<span class="fa fa-plus"></span>',
        'removeButtonText' => '<span class="fa fa-times"></span>',
        'maxItems' => 3,
        'pageNumber' => 1,
        'fields' => array($name, $email),
    ));

    $sender_name = GF_Fields::create(array(
        'type' => 'text',
        'id' => 1003,
        'formId' => $form['id'],
        'isRequired' => true,
        'label' => __('Your name'),
        'pageNumber' => 1,
    ));

    $form['fields'][] = $invitees;
    $form['fields'][] = $sender_name;

    return $form;
}

I can’t find any example of a repeater field request body. So my question is just how should my request body look like for the repeater field values? I’m using application/json as content-type.

The 400 response I receive is also not really helpful as it does not include any messages:

{
    "is_valid": false,
    "validation_messages": {
        "1000": ""
    },
    "page_number": 1,
    "source_page_number": 1
}
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