Adjust checkout pricing for existing members for Paid Memberships Pro.

pmpro-adjust-price-for-members.php

<?php
/**
 * This will adjust membership pricing depending on users current level and level checking out for. See line 10.
 * This will show you how to adjust the initial amount and/or the recurring amount. If the existing level, in this case 2, is not a recurring level please uncomment lines 12-14.
 * Add this code (L8 - L20) to your PMPro Customizations Plugin - https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */

function pmpro_adjust_price_for_members( $level ) {

	// Adjust price for existing members that currently have Membership level id 1 and are upgrading to Membership Level id 2.
	if ( pmpro_hasMembershipLevel('1') && '2' == $level->id ) {
		$level->initial_payment = '25.00'; // Change the initial amount. 
		// $level->billing_amount = '50.00'; // Change the recurring amount. - Uncomment to take affect
		// $level->cycle_number = '1'; // Change the billing cycle - Uncomment to take affect
		// $level->cycle_period = 'Month'; // Change the cycle period - Uncomment to take affect
	}

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

This recipe is included in the blog post on "Offer members a discounted rate for upgrading to a higher level" at Paid Memberships Pro here: https://www.paidmembershipspro.com/offer-members-a-discounted-rate-for-upgrading-to-a-new-level/