Change place order button text in Woocommerce checkout

Change Complete Payment text with your required custom button text and place this code snippet in the functions.php file of an active WordPress theme.

//Change place order button text
add_filter( 'woocommerce_order_button_text', 'change_place_order_button_text' );
function change_place_order_button_text() {
   return __( 'Complete Payment', 'woocommerce' );
}