Display credit card logos before the submit button on the Paid Memberships Pro Membership Checkout page.

add-credit-card-image-to-checkout.php

<?php
/**
 * Display credit card logos before the submit button on the Paid Memberships Pro Membership Checkout page.
 *
 * Download the icons from https://www.paidmembershipspro.com/add-credit-card-and-paypal-logos-to-checkout/
 * Place the image file in the correct location according to your customizations structure.
 */
function pmpro_add_my_logos_to_checkout(){
	global $pmpro_level;

	if ( ! pmpro_isLevelFree( $pmpro_level ) ){
		echo '<h2>Accepted Credit Cards</h2>';
		echo '<img alt="Credit card logos for Visa, Mastercard, Discover, and American Express" style="max-width: 300px;" src="' . plugins_url( '/images/pay-with-credit-cards.png', __FILE__ ) .'" />';
	}
}
add_action( 'pmpro_checkout_before_submit_button', 'pmpro_add_my_logos_to_checkout', 10 );