require paypal email upon signup application wc vendors pro

functions.php

//require paypal to be filled out during application
function wcv_vendor_paypal_address_required( $args ) { 
  $args[ 'custom_attributes' ] = array( 
	'data-rules' => 'required',
	'data-error' => __( 'Your PayPal email is REQUIRED.  Please enter your PayPal email address.', 'wcvendors-pro' )
	); 
    return $args; 
} 
add_filter( 'wcv_vendor_paypal_address', 'wcv_vendor_paypal_address_required' );