Get PMPro Pay By Check and PMPro Add PayPal Express to work together.

my_init_pmpro_payment_options.php

/*
	Get PMPro Pay By Check and PMPro Add PayPal Express to work together.
*/
//remove the checkout_boxes code from both plugins
function my_init_pmpro_payment_options()
{
	remove_action("pmpro_checkout_boxes", "pmpropbc_checkout_boxes");
	remove_action("pmpro_checkout_boxes", "pmproappe_pmpro_checkout_boxes", 20);
	
	add_action("pmpro_checkout_boxes", "my_pmpro_checkout_boxes_payment_options");
}
add_action('init', 'my_init_pmpro_payment_options');

//new combined checkout options
function my_pmpro_checkout_boxes_payment_options()
{
	//if already using paypal, ignore this	
	$setting_gateway = get_option("pmpro_gateway");	
		
	global $pmpro_requirebilling, $gateway, $pmpro_review;
		
	//only show this if we're not reviewing
	if(empty($pmpro_review))
	{
	?>
	<table id="pmpro_payment_method" class="pmpro_checkout top1em" width="100%" cellpadding="0" cellspacing="0" border="0" <?php if(!$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> &nbsp;					
					<input type="radio" name="gateway" value="check" <?php if($gateway == "check") { ?>checked="checked"<?php } ?> />
						<a href="javascript:void(0);" class="pmpro_radio">Pay by Check</a> &nbsp;   
				</div>
			</td>
		</tr>
	</tbody>
	</table>
	<?php //here we draw the PayPal Express button, which gets moved in place by JavaScript ?>
	<span id="pmpro_paypalexpress_checkout" style="display: none;">
		<input type="hidden" name="submit-checkout" value="1" />		
		<input type="image" value="<?php _e('Check Out with PayPal', 'pmpro');?> &raquo;" src="<?php echo apply_filters("pmpro_paypal_button_image", "https://www.paypal.com/en_US/i/btn/btn_xpressCheckout.gif");?>" />
	</span>
	<script>	
		var pmpro_require_billing = <?php if($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)
			{
				showPayPalExpressCheckout();
				
			}
			else if(jQuery('input[name=gateway]:checked').val() == 'check' && pmpro_require_billing == true)
			{			
				showFreeCheckout();
			}
			else if(pmpro_require_billing == true)
			{
				showCreditCardCheckout();
			}
			else
			{
				showFreeCheckout();
			}
			
			//select the radio button if the label is clicked on
			jQuery('a.pmpro_radio').click(function() {
				jQuery(this).prev().click();
			});
		});
	</script>
	<?php
	}
}