This recipe will allow you to charge additional extras on the user's fee. #pmpro #checkout

pmpro-one-time-signup-fee.php

<?php
/**
 * This recipe will allow you to charge additional extras on the user's fee.
 *
 * You can add this recipe to your site by creating a custom plugin
 * or using the Code Snippets plugin available for free in the WordPress repository.
 * Read this companion article for step-by-step directions on either method.
 * 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 my_pmprorh_init_signup_fee() {
	//don't break if Register Helper is not loaded
	if ( ! function_exists( 'pmprorh_add_registration_field' ) ) {
		return false;
	}

	$fields = array();
	//define the fields

	global $current_user;
	$user_id   = $current_user->ID;
	$signupfee = get_user_meta( $user_id, 'signupfee', true );

	/*
	only request signup fee for new level 1 members
	OR
	any user who has previously paid a signup fee.
	*/
	if ( ( function_exists( 'pmpro_hasMembershipLevel' ) && ! pmpro_hasMembershipLevel( 1 ) ) || 1 !== intval( $signupfee ) ) {
		$fields[] = new PMProRH_Field(
			'signupfee',                       // input name, will also be used as meta key
			'checkbox',                         // type of field
			array(
				'label'    => 'Signup Fee $30',       // custom field label
				'hint'     => 'I understand there is a new members fee',
				'levels'   => 1,
				'required' => true,
			)
		);
	}

	//add the fields into a new checkout_boxes are of the checkout page
	foreach ( $fields as $field ) {
		pmprorh_add_registration_field(
			'checkout_boxes',               // location on checkout page
			$field                      // PMProRH_Field object
		);
	}
	//that's it. see the PMPro Register Helper readme for more information and examples.
}
add_action( 'init', 'my_pmprorh_init_signup_fee' );


function my_pmpro_checkout_level_signupfee( $level ) {
	if ( ! empty( $_REQUEST['signupfee'] ) ) {
		$level->initial_payment = $level->initial_payment + 30; //to update the initial payment.
		// $level->billing_amount = $level->billing_amount + 175;  //to update recurring payments too
	}

	return $level;
}
add_filter( 'pmpro_checkout_level', 'my_pmpro_checkout_level_signupfee' );