Change the Place Order Button Text

<?php
if ( ! class_exists( 'WooCommerce' ) ) {
    return;
}

/**
 * Change the text inside the checkout submit button.
 * Edit the translated string to use your preferred label.
 */
add_filter( 'woocommerce_order_button_text', 'scseed_place_order_button_text' );
function scseed_place_order_button_text( $button_text ) {
    return esc_html__( 'Complete My Purchase', 'scseed' );
}