Change default checkout button text for Paid Memberships Pro

change-default-checkout-button-pmpro.php

<?php
/**
 * Change default checkout button
 * Simply change the text value to 'Submit' or whatever you like
 * 
 * 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_pmpro_change_default_button_text( ){

                ?>
                <span id="pmpro_submit_span">
                    <input type="hidden" name="submit-checkout" value="1" />
                    <input type="submit" class="pmpro_btn pmpro_btn-submit-checkout" value="<?php { _e('Submit', 'paid-memberships-pro'); }?>" />
                </span>
                <?php

    //show default checkout button
     return false;

}

add_filter('pmpro_checkout_default_submit_button', 'my_pmpro_change_default_button_text', 10, 2 );