register_helper_fields_with_checkbox.php

<?php
/**
 * Add the code below to your PMPro Customizations Plugin - https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */
 
 function my_pmprorh_init() {
    //don't break if Register Helper is not loaded
    if(!function_exists( 'pmprorh_add_registration_field' )) {
        return false;
    }

    $fields = array();

    $fields[] = new PMProRH_Field(
        'membership_overdue',
        'select',
        array(
            'label'     => 'Application Type:',
            'required' => true,
            'options'   => array(
                '' => '',
                'new_member' => 'New Member',
                'membership_renewal' => 'Membership Renewal',
                'donation' => 'Donation',
            )
        )   
    );

    $fields[] = new PMProRH_Field(
        "USPC_Bylaws:",
        "checkbox",
        array(
            "label" => "USPC Bylaws: I have read and agree with the principles and rules outlined in the U.S. Pleace Council Bylaws.", 
            "profile" => true,
            "required" => true,
        )
    );

    $fields[] = new PMProRH_Field(
        "phone",
        "text",
        array(
            "label" => "Phone:", 
            "profile" => true,
            "required" => true,
        )
    );

    $fields[] = new PMProRH_Field(
        "city_state",
        "text",
        array(
            "label" => "City, State:", 
            "profile" => true,
            "required" => true,
        )
    );

    $fields[] = new PMProRH_Field(
        "chapter",
        "text",
        array(
            "label" => "Chapter:", 
            "profile" => true,
            "required" => true,
        )
    );      

    //add the fields into a new checkout_boxes are of the checkout page
    foreach($fields as $field)
        pmprorh_add_registration_field(
            'checkout_boxes',               // location on checkout page
            $field                      // PMProRH_Field object
        );
    //that's it. see the PMPro Register Helper readme for more information and examples.
}
add_action( 'init', 'my_pmprorh_init' );