Add Custom Fields Example in a Checkbox Area with a Custom Name

my_pmpro_fields_for_tonis.php

<?php // Do not copy this line.

/**
 * See the PMPro Register Helper readme for more information and examples: https://www.paidmembershipspro.com/documentation/register-helper-documentation/adding-fields/
 * Please add the below code to your custom plugin or Code Snippets Plugin by following this guide - https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */

// We have to put everything in a function called on init, so we are sure Register Helper is loaded.
		function pmpro_register_field_peakbagger_init() {
	// Don't break if Register Helper is not loaded.
	if ( ! function_exists( 'pmprorh_add_registration_field' ) ) {
		return false;
	}
	pmprorh_add_checkout_box( 'w9information', 'W-9 Information' );

	// Define the fields.
	$fields_w9information     = array();
			
	$fields_w9information[]   = new PMProRH_Field(
		'legalname',
		'text',
		array(
			'label'   	=> 'Legal Name',
			'size'     	=> 40,
			'class'    	=> 'legalname',
			'profile'  	=> true,
      			'levels'     	=> 5,      // show only to level 5 members checkout
			'required' 	=> true,
		)
	);
			
	$fields_w9information[]   = new PMProRH_Field(
		'email_for_w9',
		'text',
		array(
			'label'   	=> 'Email for W-9 Information',
			'size'     	=> 40,
			'class'    	=> 'email_for_w9',
			'profile'  	=> true,
			'levels'     	=> 5,      // show only to level 5 members checkout
			'required' 	=> true,
		)
	);
			
	$fields_w9information[]   = new PMProRH_Field(
		'w9_form',
		'file',
		array(
			'label'    	=> 'Upload Filled W-9 Form',
			'size'     	=> 40,
			'hint'		=> 'Click <a href="/affiliateform">here</a> to download W-9 form for your Affiliate Registration', // add the download link here on your site, it could also be /wp-content....
			'class'    	=> 'w9_form',
			'profile'  	=> true,
			'levels'     	=> 5,      // show only to level 5 members checkout
			'required' 	=> true,
		)
	);
	
	foreach ( $fields_w9information as $field ) {
		pmprorh_add_registration_field(
			'w9information',
			$field
		);
	}
}
add_action( 'init', 'pmpro_register_field_peakbagger_init' );