Update PMPro Auto-Renewal Checkbox based on payment plan chosen (levels method).

pmproarc_update_checkbox_label.php

<?php

// Copy from below here...

/*
 * Update PMPro Auto-Renewal Checkbox based on payment plan chosen (levels method).
 */
function my_pmproarc_update_checkbox_label() {
	?>
	<script>
	jQuery(document).ready(function() {
		jQuery('input[name ="level"]').click(function() {
  			jQuery('.pmpro_checkout_field-autorenew > label').text('Yes, renew at ' + jQuery('label[for ="' + this.id + '"]').text());
		});
	});
	</script>
	<?php
}
add_action( 'pmpro_checkout_boxes', 'my_pmproarc_update_checkbox_label' );