This recipe changes the level selection text and hides the level cost text if level is a donations only level. $pmpro-donations

my-pmprodon-change-text-for-donation-only-level.php

<?php
/**
 * This recipe changes the level selection text and hides the
 * level cost text if level is a donations only level.
 * KIM - uplated to include changing the wording of "Membership Level" on the checkout page. line 56
 * EDIT line 31 with the ID's of your donation only level(s).
 *
 * This recipe assumes PMPro Donations is set up and configured.
 * @link https://www.paidmembershipspro.com/add-ons/donations-add-on/
 *
 * 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/
 */


function my_pmprodon_change_text_for_discount_only_level() {

	// Bail if necessary
	if ( ! function_exists( 'pmprodon_is_donations_only' ) ) {
		return false;
	}

	global $pmpro_level, $pmpro_pages;
	//if ( pmpro_is_checkout() || is_page( $pmpro_pages['checkout'] ) /* || is_page( $pmpro_pages['confirmation'] ) */ ) {
		// Change text if a donations only level
		//if ( pmprodon_is_donations_only( $pmpro_level->id ) ) {
		
	// Change your membership level ID here.
	if ( is_page( $pmpro_pages['checkout'] ) && isset( $_REQUEST['level'] )  && ($_REQUEST['level'] == '6' || $_REQUEST['level'] == '9' )) {
	
			add_filter( 'gettext', 'gettext_translate_donations', 10, 3 );
			add_filter( 'pmpro_level_cost_text', 'free_level_change_pmpro_level_cost_text', 10, 2 );
		}
	}

add_action( 'pmpro_checkout_preheader', 'my_pmprodon_change_text_for_discount_only_level' );

/**
 * Change the level text
 */
function gettext_translate_donations( $translated, $text, $domain ) {

	switch ( $domain ) {
		case 'paid-memberships-pro':
			switch ( $text ) {
				case 'Membership Level':
					$translated = 'Donation Level';
					break;		
				case 'You have selected the <strong>%s</strong> membership level.':
					// Your custom text string or translation here.
					$translated = 'Thank you for choosing to donate to the <strong>%s</strong>';
					break;
			}
			break;
	}

	return $translated;
}


/**
 * Remove or change the level cost for free levels.
 */
function free_level_change_pmpro_level_cost_text( $text, $level ) {
	if ( pmpro_isLevelFree( $level ) ) {
		return ''; // leave blank or enter custom level cost text here.
	} else {
		return $text;
	}
}