Change 'Choose your Payment Method' in Paid Memberships Pro

change_choose_your_payment_method_txt_pmpro.php

<?php
/**
* This code is used to change 'Choose your Payment Method' text in Paid Memberships Pro. 
* Add the function into your PMPro Customizations plugin - http://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
*/
function change_choose_your_payment( $translated_text, $text, $domain ) {

        switch ( $translated_text ) {

            case 'Choose your Payment Method' :

                $translated_text = __( 'Change this text', 'pmpro' );
                break;
        }

    return $translated_text;
}

//@link http://codex.wordpress.org/Plugin_API/Filter_Reference/gettext
add_filter( 'gettext', 'theme_change_comment_field_names', 20, 3 );