Force Add PayPal Express + Pay by Check addons to work together

pmpro-customizations.php

<?php 

/*
 * Force Add PayPal Express + Pay by Check addons to work together
 */
function my_init() {
    remove_action("pmpro_checkout_boxes", "pmpropbc_checkout_boxes");
    remove_action("pmpro_checkout_boxes", "pmproappe_pmpro_checkout_boxes", 20);
}
add_action('init', 'my_init');

function my_pmpro_checkout_boxes()
{
    global $pmpro_requirebilling, $gateway, $pmpro_review;

    //get primary gateway
    $setting_gateway = get_option("pmpro_gateway");

    //only show this if we're not reviewing, and not on paypal or check
    if (empty($pmpro_review) && $setting_gateway != 'paypal' && $setting_gateway !== 'check') {
        ?>
        <table id="pmpro_payment_method" class="pmpro_checkout top1em" width="100%" cellpadding="0" cellspacing="0"
               border="0" <?php if (!$pmpro_requirebilling) { ?>style="display: none;"<?php } ?>>
            <thead>
            <tr>
                <th><?php _e('Choose your Payment Method', 'pmpro'); ?></th>
            </tr>
            </thead>
            <tbody>
            <tr>
                <td>
                    <div>
                        <input type="radio" name="gateway" value="<?php echo esc_attr($setting_gateway); ?>"
                               <?php if (!$gateway || $gateway == $setting_gateway) { ?>checked="checked"<?php } ?> />
                        <a href="javascript:void(0);"
                           class="pmpro_radio"><?php _e('Check Out with a Credit Card Here', 'pmpro'); ?></a> &nbsp;
                        <input type="radio" name="gateway" value="paypalexpress"
                               <?php if ($gateway == "paypalexpress") { ?>checked="checked"<?php } ?> />
                        <a href="javascript:void(0);"
                           class="pmpro_radio"><?php _e('Check Out with PayPal', 'pmpro'); ?></a>
                        <input type="radio" name="gateway" value="check"
                               <?php if ($gateway == "check") { ?>checked="checked"<?php } ?> />
                        <a href="javascript:void(0);" class="pmpro_radio"><?php _e('Pay by Check', 'pmpropbc'); ?></a>

                </td>
            </tr>
            </tbody>
        </table>
        <?php //here we draw the PayPal Express button, which gets moved in place by JavaScript ?>
        <span id="pmpro_paypalexpress_checkout" style="display: none;">
		<input type="hidden" name="submit-checkout" value="1"/>
		<input type="image" value="<?php _e('Check Out with PayPal', 'pmpro'); ?> &raquo;"
               src="<?php echo apply_filters("pmpro_paypal_button_image", "https://www.paypal.com/en_US/i/btn/btn_xpressCheckout.gif"); ?>"/>
	</span>
        <script>
            var pmpro_require_billing = <?php if($pmpro_requirebilling) echo "true"; else echo "false";?>;

            //choosing payment method
            jQuery(document).ready(function () {
                //move paypal express button into submit box
                jQuery('#pmpro_paypalexpress_checkout').appendTo('div.pmpro_submit');

                function showPayPalExpressCheckout() {
                    jQuery('#pmpro_billing_address_fields').hide();
                    jQuery('#pmpro_payment_information_fields').hide();
                    jQuery('#pmpro_submit_span').hide();
                    jQuery('#pmpro_paypalexpress_checkout').show();

                    pmpro_require_billing = false;
                }

                function showCreditCardCheckout() {
                    jQuery('#pmpro_paypalexpress_checkout').hide();
                    jQuery('#pmpro_billing_address_fields').show();
                    jQuery('#pmpro_payment_information_fields').show();
                    jQuery('#pmpro_submit_span').show();

                    pmpro_require_billing = true;
                }

                function showFreeCheckout() {
                    jQuery('#pmpro_billing_address_fields').hide();
                    jQuery('#pmpro_payment_information_fields').hide();
                    jQuery('#pmpro_submit_span').show();
                    jQuery('#pmpro_paypalexpress_checkout').hide();

                    pmpro_require_billing = false;
                }

                //detect gateway change
                jQuery('input[name=gateway]').click(function () {
                    if (jQuery(this).val() == 'paypalexpress') {
                        showPayPalExpressCheckout();
                    } else if (jQuery(this).val() == 'check') {
                        showFreeCheckout();
                    } else {
                        showCreditCardCheckout();
                    }
                });

                //update radio on page load
                if (jQuery('input[name=gateway]:checked').val() != 'paypalexpress' && pmpro_require_billing == true) {
                    showCreditCardCheckout();
                }
                else if (pmpro_require_billing == true) {
                    showPayPalExpressCheckout();
                }
                else {
                    showFreeCheckout();
                }

                //select the radio button if the label is clicked on
                jQuery('a.pmpro_radio').click(function () {
                    jQuery(this).prev().click();
                })

                //every couple seconds, hide the payment method box if the level is free
                function togglePaymentMethodBox()
                {
                    if (typeof code_level !== 'undefined')
                    {
                        if(parseFloat(code_level.billing_amount) > 0 || parseFloat(code_level.initial_payent) > 0)
                        {
                            //not free
                            jQuery('#pmpro_payment_method').show();
                        }
                        else
                        {
                            //free
                            jQuery('#pmpro_payment_method').hide();
                        }
                    }
                    pmpro_toggle_payment_method_box_timer = setTimeout(function(){togglePaymentMethodBox();}, 200);
                }
                togglePaymentMethodBox();
            });
        </script>
    <?php
    }
}
add_action('pmpro_checkout_boxes', 'my_pmpro_checkout_boxes');